Answers for Project Euler

File Title Author
prob001-cspencer.pl Multiples of 3 and 5 cspence
prob001-eric256.pl Multiples of 3 and 5 Eric Hodges
prob001-grondilu.pl Multiples of 3 and 5 L. Grondin
prob001-hexmode.pl Multiples of 3 and 5 Mark A. Hershberger
prob001-unobe.pl Multiples of 3 and 5 David Romano
prob002-eric256.pl Even Fibonacci numbers Eric Hodges
prob002-gerdr.pl Even Fibonacci numbers Gerhard R
prob002-hexmode.pl Even Fibonacci numbers Mark A. Hershberger
prob003-eric256.pl Largest prime factor Eric Hodges
prob003-gerdr.pl Largest prime factor Gerhard R
prob003-hexmode.pl Largest prime factor Mark A. Hershberger
prob003-lanny.pl Largest prime factor Lanny Ripple
prob004-unobe.pl Largest palindrome product David Romano
prob004-xfix.pl Largest palindrome product Konrad Borowski
prob005-unobe.pl Smallest multiple David Romano
prob005-xfix.pl Smallest multiple Konrad Borowski
prob006-polettix.pl Sum square difference polettix
prob007-polettix.pl 10001st prime polettix
prob008-duff.pl Largest product in a series Jonathan Scott Duff
prob008-duff2.pl Largest product in a series Jonathan Scott Duff
prob009-gerdr-feeds.pl Special Pythagorean triplet Gerhard R
prob009-gerdr.pl Special Pythagorean triplet Gerhard R
prob009-polettix.pl Special Pythagorean triplet Flavio Poletti
prob010-polettix.pl Summation of primes polettix
prob011-moritz.pl Largest product in a grid Moritz Lenz
prob012-polettix.pl Highly divisible triangular number polettix
prob013-grondilu.pl Large sum L. Grondin
prob014-felher.pl Longest Collatz sequence Felix Herrmann
prob015-felher.pl Lattice paths Felix Herrmann
prob016-grondilu.pl Power digit sum L. Grondin
prob017-duff.pl Number letter counts Jonathan Scott Duff
prob018-felher.pl Maximum path sum I Felix Herrmann
prob019-grondilu.pl Counting Sundays L. Grondin
prob020-grondilu.pl Factorial digit sum L. Grondin
prob021-gerdr.pl Amicable numbers Gerhard R
prob022-grondilu.pl Names scores L. Grondin
prob023-shlomif.pl Non-abundant sums Shlomi Fish
prob024-moritz.pl Lexicographic permutations Moritz Lenz
prob025-polettix.pl 1000-digit Fibonacci number Flavio Poletti
prob026-shlomif.pl Reciprocal cycles Shlomi Fish
prob027-shlomif.pl Quadratic primes Shlomi Fish
prob028-shlomif.pl Number spiral diagonals Shlomi Fish
prob029-gerdr.pl Distinct powers Gerhard R
prob029-polettix.pl Distinct powers Flavio Poletti
prob030-andreoss.pl Digit fifth powers Andrei Osipov
prob031-shlomif.pl Coin sums Shlomi Fish
prob032-andreoss.pl Pandigital products Andrei Osipov
prob033-andreoss.pl Digit cancelling fractions Andrei Osipov
prob034-quinny.pl Digit factorials Quinn Perfetto
prob036-xenu.pl Double-base palindromes xenu
prob038-andreoss.pl Pandigital multiples Andrei Osipov
prob039-quinny.pl Integer right triangles Quinn Perfetto
prob047-gerdr.pl Distinct primes factors Gerhard R
prob052-duff.pl Permuted multiples Jonathan Scott Duff
prob053-duff.pl Combinatoric selections Jonathan Scott Duff
prob053-gerdr.pl Combinatoric selections Gerhard R
prob054-andreoss.pl Poker hands Andrei Osipov
prob059-andreoss.pl XOR decryption Andrei Osipov
prob060-andreoss.pl Prime pair sets Andrei Osipov
prob063-moritz.pl Powerful digit counts Moritz Lenz
prob063-polettix.pl Powerful digit counts polettix
prob065-andreoss.pl Convergents of e Andrei Osipov
prob066-andreoss.pl Diophantine equation Andrei Osipov
prob067-felher.pl Maximum path sum II Felix Herrmann
prob080-andreoss.pl Square root digital expansion Andrei Osipov
prob081-moritz.pl Path sum: two ways Moritz Lenz
prob089-andreoss.pl Roman numerals Andrei Osipov
prob092-moritz.pl Square digit chains Moritz Lenz
prob097-andreoss.pl Large non-Mersenne prime Andrei Osipov
prob098-andreoss.pl Anagramic squares Andrei Osipov
prob099-andreoss.pl Largest exponential Andrei Osipov
prob100-andreoss.pl Arranged probability Andrei Osipov
prob104-moritz.pl Pandigital Fibonacci ends Moritz Lenz
prob105-shlomif.p6 Special subset sums: testing Shlomi Fish
prob125-shlomif.p6 Palindromic sums Shlomi Fish
prob149-shlomif.pl Searching for a maximum-sum subsequence Shlomi Fish
prob151-shlomif.pl Paper sheets of standard sizes: an expected-value problem Shlomi Fish
prob168-shlomif.pl Number Rotations Shlomi Fish
prob188-shlomif.pl The hyperexponentiation of a number Shlomi Fish
prob189-shlomif.pl Tri-colouring a triangular grid Shlomi Fish
prob286-shlomif.p6 Scoring probabilities Shlomi Fish
prob288-shlomif.p6 An enormous factorial Shlomi Fish
prob329-shlomif.p6 Prime Frog Shlomi Fish
prob463-shlomif.p6 A weird recurrence relation Shlomi Fish
prob539-shlomif.p6 Odd elimination Shlomi Fish
prob551-shlomif.p6 Sum of digits sequence Shlomi Fish