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resources
 
 
001-multiples-of-3-and-5.hs
001-multiples-of-3-and-5.hs
 
 
002-even-fibonacci-numbers.hs
002-even-fibonacci-numbers.hs
 
 
003-largest-prime-factor.hs
003-largest-prime-factor.hs
 
 
004-largest-palindrome-product.hs
004-largest-palindrome-product.hs
 
 
005-smallest-multiple.hs
005-smallest-multiple.hs
 
 
006-sum-square-difference.hs
006-sum-square-difference.hs
 
 
007-10001st-prime.hs
007-10001st-prime.hs
 
 
008-largest-product-in-a-series.hs
008-largest-product-in-a-series.hs
 
 
009-special-pythagorean-triplet.hs
009-special-pythagorean-triplet.hs
 
 
010-summation-of-primes.hs
010-summation-of-primes.hs
 
 
011-largest-product-in-a-grid.hs
011-largest-product-in-a-grid.hs
 
 
012-highly-divisible-triangular-number.hs
012-highly-divisible-triangular-number.hs
 
 
013-large-sum.hs
013-large-sum.hs
 
 
014-longest-collatz-sequence.hs
014-longest-collatz-sequence.hs
 
 
015-lattice-paths.hs
015-lattice-paths.hs
 
 
016-power-digit-sum.hs
016-power-digit-sum.hs
 
 
017-number-letter-counts.hs
017-number-letter-counts.hs
 
 
018-maximum-path-sum-i.hs
018-maximum-path-sum-i.hs
 
 
019-counting-sundays.hs
019-counting-sundays.hs
 
 
020-factorial-digit-sum.hs
020-factorial-digit-sum.hs
 
 
021-amicable-numbers.hs
021-amicable-numbers.hs
 
 
022-names-scores.hs
022-names-scores.hs
 
 
023-non-abundant-sums.hs
023-non-abundant-sums.hs
 
 
024-lexicographic-permutations.hs
024-lexicographic-permutations.hs
 
 
025-1000-digit-fibonacci-number.hs
025-1000-digit-fibonacci-number.hs
 
 
026-reciprocal-cycles.hs
026-reciprocal-cycles.hs
 
 
027-quadratic-primes.hs
027-quadratic-primes.hs
 
 
028-number-spiral-diagonals.hs
028-number-spiral-diagonals.hs
 
 
029-distinct-powers.hs
029-distinct-powers.hs
 
 
030-digit-fifth-powers.hs
030-digit-fifth-powers.hs
 
 
031-coin-sums.hs
031-coin-sums.hs
 
 
032-pandigital-products.hs
032-pandigital-products.hs
 
 
033-digit-cancelling-fractions.hs
033-digit-cancelling-fractions.hs
 
 
034-digit-factorials.hs
034-digit-factorials.hs
 
 
035-circular-primes.hs
035-circular-primes.hs
 
 
036-double-base-palindrome.hs
036-double-base-palindrome.hs
 
 
037-truncatable-primes.hs
037-truncatable-primes.hs
 
 
038-pandigital-multiples.hs
038-pandigital-multiples.hs
 
 
039-integer-right-triangles.hs
039-integer-right-triangles.hs
 
 
040-champernownes-constant.hs
040-champernownes-constant.hs
 
 
041-pandigital-prime.hs
041-pandigital-prime.hs
 
 
042-coded-triangle-numbers.hs
042-coded-triangle-numbers.hs
 
 
043-sub-string-divisibility.hs
043-sub-string-divisibility.hs
 
 
044-pentagon-numbers.hs
044-pentagon-numbers.hs
 
 
045-triangular-pentagonal-and-hexagonal.hs
045-triangular-pentagonal-and-hexagonal.hs
 
 
046-goldbachs-other-conjecture.hs
046-goldbachs-other-conjecture.hs
 
 
047-distinct-prime-factors.hs
047-distinct-prime-factors.hs
 
 
048-self-powers.hs
048-self-powers.hs
 
 
049-prime-permutations.hs
049-prime-permutations.hs
 
 
050-consecutive-prime-sum.hs
050-consecutive-prime-sum.hs
 
 
052-permuted-multiples.hs
052-permuted-multiples.hs
 
 
053-combinatoric-selections.hs
053-combinatoric-selections.hs
 
 
054-poker-hands.hs
054-poker-hands.hs
 
 
055-lychrel-numbers.hs
055-lychrel-numbers.hs
 
 
056-powerful-digit-sum.hs
056-powerful-digit-sum.hs
 
 
057-square-root-convergents.hs
057-square-root-convergents.hs
 
 
058-spiral-primes.hs
058-spiral-primes.hs
 
 
061-cyclical-figurate-numbers.hs
061-cyclical-figurate-numbers.hs
 
 
062-cubic-permutations.hs
062-cubic-permutations.hs
 
 
063-powerful-digit-counts.hs
063-powerful-digit-counts.hs
 
 
067-maximum-path-sum-ii.hs
067-maximum-path-sum-ii.hs
 
 
071-ordered-fractions.hs
071-ordered-fractions.hs
 
 
074-digit-factorial-chains.hs
074-digit-factorial-chains.hs
 
 
079-passcode-derivation.hs
079-passcode-derivation.hs
 
 
087-prime-power-triples.hs
087-prime-power-triples.hs
 
 
089-roman-numerals.hs
089-roman-numerals.hs
 
 
092-square-digit-chains.hs
092-square-digit-chains.hs
 
 
097-large-non-mersenne-prime.hs
097-large-non-mersenne-prime.hs
 
 
099-largest-exponential.hs
099-largest-exponential.hs
 
 
100-arranged-probability.lhs
100-arranged-probability.lhs
 
 
README.md
README.md
 
 

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λ Project Euler

Solutions to problems posted on Project Euler written in Haskell.

Every problem admits a solution that requires less than a minute of computing time according to the Project Euler faq.

1 — 100
001 ✓ 011 ✓ 021 ✓ 031 ✓ 041 ✓ 051 061 ✓ 071 ✓ 081 091
002 ✓ 012 ✓ 022 ✓ 032 ✓ 042 ✓ 052 ✓ 062 ✓ 072 082 092 ✓
003 ✓ 013 ✓ 023 ✓ 033 ✓ 043 ✓ 053 ✓ 063 ✓ 073 083 093
004 ✓ 014 ✓ 024 ✓ 034 ✓ 044 ✓ 054 ✓ 064 074 ✓ 084 094
005 ✓ 015 ✓ 025 ✓ 035 ✓ 045 ✓ 055 ✓ 065 075 085 095
006 ✓ 016 ✓ 026 ✓ 036 ✓ 046 ✓ 056 ✓ 066 076 086 096
007 ✓ 017 ✓ 027 ✓ 037 ✓ 047 ✓ 057 ✓ 067 ✓ 077 087 ✓ 097 ✓
008 ✓ 018 ✓ 028 ✓ 038 ✓ 048 ✓ 058 ✓ 068 078 088 098
009 ✓ 019 ✓ 029 ✓ 039 ✓ 049 ✓ 059 069 079 ✓ 089 ✓ 099 ✓
010 ✓ 020 ✓ 030 ✓ 040 ✓ 050 ✓ 060 070 080 090 100 ✓

Completed puzzles are marked with either one of the below icons so that I can keep track of which puzzles still need work.

  • ✓ program produces the correct answer, it might take (much) longer than a minute to run with $ runhaskell but will be considerably faster than a minute when compiled with $ ghc -O3
  • 🐌 program produces the correct answer but it takes longer than a minute to run, even when compiled using $ ghc -O3, in other words: it needs work.

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Solutions to some puzzles on https://projecteuler.net

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