Project-Euler-Problems

This repo contains solutions for projecteuler problems. Specially created for newcomers to contribute as part of Hacktoberfest Challenge.

hacktoberfest-projecteuler

This repo contains solutions for projecteuler problems. Specially created for newcomers to contribute as part of Hacktoberfest Challenge.

Kind request to everyone that before sending any pull request test your solutions on projecteuler.net.

List of Problems

Problem #1 Multiples of 3 and 5
Problem #2 Even Fibonacci numbers
Problem #3 Largest prime factor
Problem #4 Largest palindrome product
Problem #5 Smallest multiple
Problem #6 Sum square difference
Problem #7 10001st prime
Problem #8 Largest product in a series
Problem #9 Special Pythagorean triplet
Problem #10 Summation of primes
Problem #11 Largest product in a grid
Problem #12 Highly divisible triangular number
Problem #13 Large sum
Problem #14 Longest Collatz sequence
Problem #15 Lattice paths
Problem #16 Power digit sum
Problem #17 Number letter counts
Problem #18 Maximum path sum I
Problem #19 Counting Sundays
Problem #20 Factorial digit sum
Problem #21 Amicable numbers
Problem #22 Names scores
Problem #23 Non-abundant sums
Problem #24 Lexicographic permutations
Problem #25 1000-digit Fibonacci number
Problem #26 Reciprocal cycles
Problem #27 Quadratic primes
Problem #28 Number spiral diagonals
Problem #29 Distinct powers
Problem #30 Digit fifth powers
Problem #31 Coin sums
Problem #32 Pandigital products
Problem #33 Digit cancelling fractions
Problem #34 Digit factorials
Problem #35 Circular primes
Problem #36 Double-base palindromes
Problem #37 Truncatable primes
Problem #38 Pandigital multiples
Problem #39 Integer right triangles
Problem #40 Champernowne's constant
Problem #41 Pandigital prime
Problem #42 Coded triangle numbers
Problem #43 Sub-string divisibility
Problem #44 Pentagon numbers
Problem #45 Triangular, pentagonal, and hexagonal
Problem #46 Goldbach's other conjecture
Problem #47 Distinct primes factors
Problem #48 Self powers
Problem #49 Prime permutations
Problem #50 Consecutive prime sum
Problem #51 Prime digit replacements
Problem #52 Permuted multiples
Problem #53 Combinatoric selections
Problem #54 Poker hands
Problem #55 Lychrel numbers
Problem #56 Powerful digit sum
Problem #57 Square root convergents
Problem #58 Spiral primes
Problem #59 XOR decryption
Problem #60 Prime pair sets
Problem #61 Cyclical figurate numbers
Problem #62 Cubic permutations
Problem #63 Powerful digit counts
Problem #64 Odd period square roots
Problem #65 Convergents of e
Problem #66 Diophantine equation
Problem #67 Maximum path sum II
Problem #68 Magic 5-gon ring
Problem #69 Totient maximum
Problem #70 Totient permutation
Problem #71 Ordered fractions
Problem #72 Counting fractions
Problem #73 Counting fractions in a range
Problem #74 Digit factorial chains
Problem #75 Singular integer right triangles
Problem #76 Counting summations
Problem #77 Prime summations
Problem #78 Coin partitions
Problem #79 Passcode derivation
Problem #80 Square root digital expansion
Problem #81 Path sum: two ways
Problem #82 Path sum: three ways
Problem #83 Path sum: four ways
Problem #84 Monopoly odds
Problem #85 Counting rectangles
Problem #86 Cuboid route
Problem #87 Prime power triples
Problem #88 Product-sum numbers
Problem #89 Roman numerals
Problem #90 Cube digit pairs
Problem #91 Right triangles with integer coordinates
Problem #92 Square digit chains
Problem #93 Arithmetic expressions
Problem #94 Almost equilateral triangles
Problem #95 Amicable chains
Problem #96 Su Doku
Problem #97 Large non-Mersenne prime
Problem #98 Anagramic squares
Problem #99 Largest exponential
Problem #100 Arranged probability
Problem #101 Optimum polynomial
Problem #102 Triangle containment
Problem #103 Special subset sums: optimum
Problem #104 Pandigital Fibonacci ends
Problem #105 Special subset sums: testing
Problem #106 Special subset sums: meta-testing
Problem #107 Minimal network
Problem #108 Diophantine reciprocals I
Problem #109 Darts
Problem #110 Diophantine reciprocals II
Problem #111 Primes with runs
Problem #112 Bouncy numbers
Problem #113 Non-bouncy numbers
Problem #114 Counting block combinations I
Problem #115 Counting block combinations II
Problem #116 Red, green or blue tiles
Problem #117 Red, green, and blue tiles
Problem #118 Pandigital prime sets
Problem #119 Digit power sum
Problem #120 Square remainders
Problem #121 Disc game prize fund
Problem #122 Efficient exponentiation
Problem #123 Prime square remainders
Problem #124 Ordered radicals
Problem #125 Palindromic sums
Problem #126 Cuboid layers
Problem #127 abc-hits
Problem #128 Hexagonal tile differences
Problem #129 Repunit divisibility
Problem #130 Composites with prime repunit property
Problem #131 Prime cube partnership
Problem #132 Large repunit factors
Problem #133 Repunit nonfactors
Problem #134 Prime pair connection
Problem #135 Same differences
Problem #136 Singleton difference
Problem #137 Fibonacci golden nuggets
Problem #138 Special isosceles triangles
Problem #139 Pythagorean tiles
Problem #140 Modified Fibonacci golden nuggets
Problem #141 Investigating progressive numbers, n, which are also square
Problem #142 Perfect Square Collection
Problem #143 Investigating the Torricelli point of a triangle
Problem #144 Investigating multiple reflections of a laser beam
Problem #145 How many reversible numbers are there below one-billion?
Problem #146 Investigating a Prime Pattern
Problem #147 Rectangles in cross-hatched grids
Problem #148 Exploring Pascal's triangle
Problem #149 Searching for a maximum-sum subsequence
Problem #150 Searching a triangular array for a sub-triangle having minimum-sum
Problem #151 Paper sheets of standard sizes: an expected-value problem
Problem #152 Writing 1/2 as a sum of inverse squares
Problem #153 Investigating Gaussian Integers
Problem #154 Exploring Pascal's pyramid
Problem #155 Counting Capacitor Circuits
Problem #156 Counting Digits
Problem #157 Solving the diophantine equation 1/a+1/b= p/10n
Problem #158 Exploring strings for which only one character comes lexicographically after its neighbour to the left
Problem #159 Digital root sums of factorisations
Problem #160 Factorial trailing digits
Problem #161 Triominoes
Problem #162 Hexadecimal numbers
Problem #163 Cross-hatched triangles
Problem #164 Numbers for which no three consecutive digits have a sum greater than a given value
Problem #165 Intersections
Problem #166 Criss Cross
Problem #167 Investigating Ulam sequences
Problem #168 Number Rotations
Problem #169 Exploring the number of different ways a number can be expressed as a sum of powers of 2
Problem #170 Find the largest 0 to 9 pandigital that can be formed by concatenating products
Problem #171 Finding numbers for which the sum of the squares of the digits is a square
Problem #172 Investigating numbers with few repeated digits
Problem #173 Using up to one million tiles how many different "hollow" square laminae can be formed?
Problem #174 Counting the number of "hollow" square laminae that can form one, two, three, ... distinct arrangements
Problem #175 Fractions involving the number of different ways a number can be expressed as a sum of powers of 2
Problem #176 Right-angled triangles that share a cathetus
Problem #177 Integer angled Quadrilaterals
Problem #178 Step Numbers
Problem #179 Consecutive positive divisors
Problem #180 Rational zeros of a function of three variables
Problem #181 Investigating in how many ways objects of two different colours can be grouped
Problem #182 RSA encryption
Problem #183 Maximum product of parts
Problem #184 Triangles containing the origin
Problem #185 Number Mind
Problem #186 Connectedness of a network
Problem #187 Semiprimes
Problem #188 The hyperexponentiation of a number
Problem #189 Tri-colouring a triangular grid
Problem #190 Maximising a weighted product
Problem #191 Prize Strings
Problem #192 Best Approximations
Problem #193 Squarefree Numbers
Problem #194 Coloured Configurations
Problem #195 Inscribed circles of triangles with one angle of 60 degrees
Problem #196 Prime triplets
Problem #197 Investigating the behaviour of a recursively defined sequence
Problem #198 Ambiguous Numbers
Problem #199 Iterative Circle Packing
Problem #200 Find the 200th prime-proof sqube containing the contiguous sub-string "200"
Problem #201 Subsets with a unique sum
Problem #202 Laserbeam
Problem #203 Squarefree Binomial Coefficients
Problem #204 Generalised Hamming Numbers
Problem #205 Dice Game
Problem #206 Concealed Square
Problem #207 Integer partition equations
Problem #208 Robot Walks
Problem #209 Circular Logic
Problem #210 Obtuse Angled Triangles
Problem #211 Divisor Square Sum
Problem #212 Combined Volume of Cuboids
Problem #213 Flea Circus
Problem #214 Totient Chains
Problem #215 Crack-free Walls
Problem #216 Investigating the primality of numbers of the form 2n2-1
Problem #217 Balanced Numbers
Problem #218 Perfect right-angled triangles
Problem #219 Skew-cost coding
Problem #220 Heighway Dragon
Problem #221 Alexandrian Integers
Problem #222 Sphere Packing
Problem #223 Almost right-angled triangles I
Problem #224 Almost right-angled triangles II
Problem #225 Tribonacci non-divisors
Problem #226 A Scoop of Blancmange
Problem #227 The Chase
Problem #228 Minkowski Sums
Problem #229 Four Representations using Squares
Problem #230 Fibonacci Words
Problem #231 The prime factorisation of binomial coefficients
Problem #232 The Race
Problem #233 Lattice points on a circle
Problem #234 Semidivisible numbers
Problem #235 An Arithmetic Geometric sequence
Problem #236 Luxury Hampers
Problem #237 Tours on a 4 x n playing board
Problem #238 Infinite string tour
Problem #239 Twenty-two Foolish Primes
Problem #240 Top Dice
Problem #241 Perfection Quotients
Problem #242 Odd Triplets
Problem #243 Resilience
Problem #244 Sliders
Problem #245 Coresilience
Problem #246 Tangents to an ellipse
Problem #247 Squares under a hyperbola
Problem #248 Numbers for which Euler’s totient function equals 13!
Problem #249 Prime Subset Sums
Problem #250 250250
Problem #251 Cardano Triplets
Problem #252 Convex Holes
Problem #253 Tidying up
Problem #254 Sums of Digit Factorials
Problem #255 Rounded Square Roots
Problem #256 Tatami-Free Rooms
Problem #257 Angular Bisectors
Problem #258 A lagged Fibonacci sequence
Problem #259 Reachable Numbers
Problem #260 Stone Game
Problem #261 Pivotal Square Sums
Problem #262 Mountain Range
Problem #263 An engineers' dream come true
Problem #264 Triangle Centres
Problem #265 Binary Circles
Problem #266 Pseudo Square Root
Problem #267 Billionaire
Problem #268 Counting numbers with at least four distinct prime factors less than 100
Problem #269 Polynomials with at least one integer root
Problem #270 Cutting Squares
Problem #271 Modular Cubes, part 1
Problem #272 Modular Cubes, part 2
Problem #273 Sum of Squares
Problem #274 Divisibility Multipliers
Problem #275 Balanced Sculptures
Problem #276 Primitive Triangles
Problem #277 A Modified Collatz sequence
Problem #278 Linear Combinations of Semiprimes
Problem #279 Triangles with integral sides and an integral angle
Problem #280 Ant and seeds
Problem #281 Pizza Toppings
Problem #282 The Ackermann function
Problem #283 Integer sided triangles for which the area/perimeter ratio is integral
Problem #284 Steady Squares
Problem #285 Pythagorean odds
Problem #286 Scoring probabilities
Problem #287 Quadtree encoding (a simple compression algorithm)
Problem #288 An enormous factorial
Problem #289 Eulerian Cycles
Problem #290 Digital Signature
Problem #291 Panaitopol Primes
Problem #292 Pythagorean Polygons
Problem #293 Pseudo-Fortunate Numbers
Problem #294 Sum of digits - experience #23
Problem #295 Lenticular holes
Problem #296 Angular Bisector and Tangent
Problem #297 Zeckendorf Representation
Problem #298 Selective Amnesia
Problem #299 Three similar triangles
Problem #300 Protein folding
Problem #301 Nim
Problem #302 Strong Achilles Numbers
Problem #303 Multiples with small digits
Problem #304 Primonacci
Problem #305 Reflexive Position
Problem #306 Paper-strip Game
Problem #307 Chip Defects
Problem #308 An amazing Prime-generating Automaton
Problem #309 Integer Ladders
Problem #310 Nim Square
Problem #311 Biclinic Integral Quadrilaterals
Problem #312 Cyclic paths on Sierpiński graphs
Problem #313 Sliding game
Problem #314 The Mouse on the Moon
Problem #315 Digital root clocks
Problem #316 Numbers in decimal expansions
Problem #317 Firecracker
Problem #318 2011 nines
Problem #319 Bounded Sequences
Problem #320 Factorials divisible by a huge integer
Problem #321 Swapping Counters
Problem #322 Binomial coefficients divisible by 10
Problem #323 Bitwise-OR operations on random integers
Problem #324 Building a tower
Problem #325 Stone Game II
Problem #326 Modulo Summations
Problem #327 Rooms of Doom
Problem #328 Lowest-cost Search
Problem #329 Prime Frog
Problem #330 Euler's Number
Problem #331 Cross flips
Problem #332 Spherical triangles
Problem #333 Special partitions
Problem #334 Spilling the beans
Problem #335 Gathering the beans
Problem #336 Maximix Arrangements
Problem #337 Totient Stairstep Sequences
Problem #338 Cutting Rectangular Grid Paper
Problem #339 Peredur fab Efrawg
Problem #340 Crazy Function
Problem #341 Golomb's self-describing sequence
Problem #342 The totient of a square is a cube
Problem #343 Fractional Sequences
Problem #344 Silver dollar game
Problem #345 Matrix Sum
Problem #346 Strong Repunits
Problem #347 Largest integer divisible by two primes
Problem #348 Sum of a square and a cube
Problem #349 Langton's ant
Problem #350 Constraining the least greatest and the greatest least
Problem #351 Hexagonal orchards
Problem #352 Blood tests
Problem #353 Risky moon
Problem #354 Distances in a bee's honeycomb
Problem #355 Maximal coprime subset
Problem #356 Largest roots of cubic polynomials
Problem #357 Prime generating integers
Problem #358 Cyclic numbers
Problem #359 Hilbert's New Hotel
Problem #360 Scary Sphere
Problem #361 Subsequence of Thue-Morse sequence
Problem #362 Squarefree factors
Problem #363 Bézier Curves
Problem #364 Comfortable distance
Problem #365 A huge binomial coefficient
Problem #366 Stone Game III
Problem #367 Bozo sort
Problem #368 A Kempner-like series
Problem #369 Badugi
Problem #370 Geometric triangles
Problem #371 Licence plates
Problem #372 Pencils of rays
Problem #373 Circumscribed Circles
Problem #374 Maximum Integer Partition Product
Problem #375 Minimum of subsequences
Problem #376 Nontransitive sets of dice
Problem #377 Sum of digits, experience 13
Problem #378 Triangle Triples
Problem #379 Least common multiple count
Problem #380 Amazing Mazes!
Problem #381 (prime-k) factorial
Problem #382 Generating polygons
Problem #383 Divisibility comparison between factorials
Problem #384 Rudin-Shapiro sequence
Problem #385 Ellipses inside triangles
Problem #386 Maximum length of an antichain
Problem #387 Harshad Numbers
Problem #388 Distinct Lines
Problem #389 Platonic Dice
Problem #390 Triangles with non rational sides and integral area
Problem #391 Hopping Game
Problem #392 Enmeshed unit circle
Problem #393 Migrating ants
Problem #394 Eating pie
Problem #395 Pythagorean tree
Problem #396 Weak Goodstein sequence
Problem #397 Triangle on parabola
Problem #398 Cutting rope
Problem #399 Squarefree Fibonacci Numbers
Problem #400 Fibonacci tree game
Problem #401 Sum of squares of divisors
Problem #402 Integer-valued polynomials
Problem #403 Lattice points enclosed by parabola and line
Problem #404 Crisscross Ellipses
Problem #405 A rectangular tiling
Problem #406 Guessing Game
Problem #407 Idempotents
Problem #408 Admissible paths through a grid
Problem #409 Nim Extreme
Problem #410 Circle and tangent line
Problem #411 Uphill paths
Problem #412 Gnomon numbering
Problem #413 One-child Numbers
Problem #414 Kaprekar constant
Problem #415 Titanic sets
Problem #416 A frog's trip
Problem #417 Reciprocal cycles II
Problem #418 Factorisation triples
Problem #419 Look and say sequence
Problem #420 2x2 positive integer matrix
Problem #421 Prime factors of n15+1
Problem #422 Sequence of points on a hyperbola
Problem #423 Consecutive die throws
Problem #424 Kakuro
Problem #425 Prime connection
Problem #426 Box-ball system
Problem #427 n-sequences
Problem #428 Necklace of circles
Problem #429 Sum of squares of unitary divisors
Problem #430 Range flips
Problem #431 Square Space Silo
Problem #432 Totient sum
Problem #433 Steps in Euclid's algorithm
Problem #434 Rigid graphs
Problem #435 Polynomials of Fibonacci numbers
Problem #436 Unfair wager
Problem #437 Fibonacci primitive roots
Problem #438 Integer part of polynomial equation's solutions
Problem #439 Sum of sum of divisors
Problem #440 GCD and Tiling
Problem #441 The inverse summation of coprime couples
Problem #442 Eleven-free integers
Problem #443 GCD sequence
Problem #444 The Roundtable Lottery
Problem #445 Retractions A
Problem #446 Retractions B
Problem #447 Retractions C
Problem #448 Average least common multiple
Problem #449 Chocolate covered candy
Problem #450 Hypocycloid and Lattice points
Problem #451 Modular inverses
Problem #452 Long Products
Problem #453 Lattice Quadrilaterals
Problem #454 Diophantine reciprocals III
Problem #455 Powers With Trailing Digits
Problem #456 Triangles containing the origin II
Problem #457 A polynomial modulo the square of a prime
Problem #458 Permutations of Project
Problem #459 Flipping game
Problem #460 An ant on the move
Problem #461 Almost Pi
Problem #462 Permutation of 3-smooth numbers
Problem #463 A weird recurrence relation
Problem #464 Möbius function and intervals
Problem #465 Polar polygons
Problem #466 Distinct terms in a multiplication table
Problem #467 Superinteger
Problem #468 Smooth divisors of binomial coefficients
Problem #469 Empty chairs
Problem #470 Super Ramvok
Problem #471 Triangle inscribed in ellipse
Problem #472 Comfortable Distance II
Problem #473 Phigital number base
Problem #474 Last digits of divisors
Problem #475 Music festival
Problem #476 Circle Packing II
Problem #477 Number Sequence Game
Problem #478 Mixtures
Problem #479 Roots on the Rise
Problem #480 The Last Question
Problem #481 Chef Showdown
Problem #482 The incenter of a triangle
Problem #483 Repeated permutation
Problem #484 Arithmetic Derivative
Problem #485 Maximum number of divisors
Problem #486 Palindrome-containing strings
Problem #487 Sums of power sums
Problem #488 Unbalanced Nim
Problem #489 Common factors between two sequences
Problem #490 Jumping frog
Problem #491 Double pandigital number divisible by 11
Problem #492 Exploding sequence
Problem #493 Under The Rainbow
Problem #494 Collatz prefix families
Problem #495 Writing n as the product of k distinct positive integers
Problem #496 Incenter and circumcenter of triangle
Problem #497 Drunken Tower of Hanoi
Problem #498 Remainder of polynomial division
Problem #499 St. Petersburg Lottery
Problem #500 Problem 500!!!
Problem #501 Eight Divisors
Problem #502 Counting Castles
Problem #503 Compromise or persist
Problem #504 Square on the Inside
Problem #505 Bidirectional Recurrence
Problem #506 Clock sequence
Problem #507 Shortest Lattice Vector
Problem #508 Integers in base i-1
Problem #509 Divisor Nim
Problem #510 Tangent Circles
Problem #511 Sequences with nice divisibility properties
Problem #512 Sums of totients of powers
Problem #513 Integral median
Problem #514 Geoboard Shapes
Problem #515 Dissonant Numbers
Problem #516 5-smooth totients
Problem #517 A real recursion
Problem #518 Prime triples and geometric sequences
Problem #519 Tricolored Coin Fountains
Problem #520 Simbers
Problem #521 Smallest prime factor
Problem #522 Hilbert's Blackout
Problem #523 First Sort I
Problem #524 First Sort II
Problem #525 Rolling Ellipse
Problem #526 Largest prime factors of consecutive numbers
Problem #527 Randomized Binary Search
Problem #528 Constrained Sums
Problem #529 10-substrings
Problem #530 GCD of Divisors
Problem #531 Chinese leftovers
Problem #532 Nanobots on Geodesics
Problem #533 Minimum values of the Carmichael function
Problem #534 Weak Queens
Problem #535 Fractal Sequence
Problem #536 Modulo power identity
Problem #537 Counting tuples
Problem #538 Maximum quadrilaterals
Problem #539 Odd elimination
Problem #540 Counting primitive Pythagorean triples
Problem #541 Divisibility of Harmonic Number Denominators
Problem #542 Geometric Progression with Maximum Sum
Problem #543 Prime-Sum Numbers
Problem #544 Chromatic Conundrum
Problem #545 Faulhaber's Formulas
Problem #546 The Floor's Revenge
Problem #547 Distance of random points within hollow square laminae
Problem #548 Gozinta Chains
Problem #549 Divisibility of factorials
Problem #550 Divisor game
Problem #551 Sum of digits sequence
Problem #552 Chinese leftovers II
Problem #553 Power sets of power sets
Problem #554 Centaurs on a chess board
Problem #555 McCarthy 91 function
Problem #556 Squarefree Gaussian Integers
Problem #557 Cutting triangles
Problem #558 Irrational base
Problem #559 Permuted Matrices
Problem #560 Coprime Nim
Problem #561 Divisor Pairs
Problem #562 Maximal perimeter
Problem #563 Robot Welders
Problem #564 Maximal polygons
Problem #565 Divisibility of sum of divisors
Problem #566 Cake Icing Puzzle
Problem #567 Reciprocal games I
Problem #568 Reciprocal games II
Problem #569 Prime Mountain Range
Problem #570 Snowflakes
Problem #571 Super Pandigital Numbers
Problem #572 Idempotent matrices
Problem #573 Unfair race
Problem #574 Verifying Primes
Problem #575 Wandering Robots
Problem #576 Irrational jumps
Problem #577 Counting hexagons
Problem #578 Integers with decreasing prime powers
Problem #579 Lattice points in lattice cubes
Problem #580 Squarefree Hilbert numbers
Problem #581 47-smooth triangular numbers
Problem #582 Nearly isosceles 120 degree triangles
Problem #583 Heron Envelopes
Problem #584 Birthday Problem Revisited
Problem #585 Nested square roots
Problem #586 Binary Quadratic Form
Problem #587 Concave triangle
Problem #588 Quintinomial coefficients
Problem #589 Poohsticks Marathon
Problem #590 Sets with a given Least Common Multiple
Problem #591 Best Approximations by Quadratic Integers
Problem #592 Factorial trailing digits 2
Problem #593 Fleeting Medians
Problem #594 Rhombus Tilings
Problem #595 Incremental Random Sort
Problem #596 Number of lattice points in a hyperball
Problem #597 Torpids
Problem #598 Split Divisibilities
Problem #599 Distinct Colourings of a Rubik's Cube
Problem #600 Integer sided equiangular hexagons
Problem #601 Divisibility streaks
Problem #602 Product of Head Counts

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hacktoberfest-projecteuler

Kind request to everyone that before sending any pull request test your solutions on projecteuler.net.

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