Yet another repository with solutions to the Project Euler problems.
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| 140 | Modified Fibonacci golden nuggets | 02 May 22 (11:46.58) |
| 137 | Fibonacci golden nuggets | 05 Feb 22 (16:21.35) |
| 190 | Maximising a weighted product | 18 Nov 21 (03:07.51) |
| 622 | Riffle Shuffles | 27 Oct 21 (17:00.18) |
| 243 | Resilience | 15 Oct 21 (22:04.01) |
| 401 | Sum of squares of divisors | 13 Oct 21 (16:15.51) |
| 435 | Polynomials of Fibonacci numbers | 01 Oct 21 (14:03.46) |
| 203 | Squarefree Binomial Coefficients | 22 Sep 21 (00:07.35) |
| 78 | Coin partitions | 19 Sep 21 (19:08.04) |
| 148 | Exploring Pascal's triangle | 19 Sep 21 (14:58.31) |
| 64 | Odd period square roots | 17 Sep 21 (16:35.55) |
| 684 | Inverse Digit Sum | 08 Feb 21 (00:58.21) |
| 80 | Square root digital expansion | 23 Dec 20 (22:38.50) |
| 381 | (prime-k) factorial | 22 Dec 20 (18:58.28) |
| 204 | Generalised Hamming Numbers | 21 Dec 20 (09:46.42) |
| 209 | Circular Logic | 03 Dec 20 (06:15.51) |
| 686 | Powers of Two | 01 Dec 20 (14:50.07) |
| 357 | Prime generating integers | 01 Dec 20 (08:13.43) |
| 104 | Pandigital Fibonacci ends | 30 Nov 20 (14:13.53) |
| 700 | Eulercoin | 30 Nov 20 (07:11.07) |
| 98 | Anagramic squares | 26 Nov 20 (07:20.18) |
| 107 | Minimal network | 26 Nov 20 (03:45.28) |
| 91 | Right triangles with integer coordinates | 25 Nov 20 (01:46.49) |
| 95 | Amicable chains | 23 Nov 20 (08:53.09) |
| 70 | Totient permutation | 21 Nov 20 (22:32.30) |
| 100 | Arranged probability | 04 Jul 17 (03:41.01) |
| 607 | Marsh Crossing | 28 Jun 17 (19:44.33) |
| 577 | Counting hexagons | 13 Mar 17 (00:19.26) |
| 187 | Semiprimes | 08 Mar 17 (01:34.25) |
| 500 | Problem 500!!! | 20 Feb 17 (05:05.54) |
| 587 | Concave triangle | 17 Feb 17 (18:38.36) |
| 121 | Disc game prize fund | 19 Mar 16 (03:28.24) |
| 76 | Counting summations | 29 Dec 15 (01:07.17) |
| 65 | Convergents of e | 19 Dec 15 (20:18.44) |
| 205 | Dice Game | 23 Oct 15 (02:52.59) |
| 346 | Strong Repunits | 17 Oct 15 (13:50.22) |
| 73 | Counting fractions in a range | 11 Oct 15 (02:43.06) |
| 162 | Hexadecimal numbers | 08 Oct 15 (09:43.59) |
| 72 | Counting fractions | 01 Oct 15 (02:08.52) |
| 145 | How many reversible numbers are there below one-billion? | 25 Sep 15 (01:55.46) |
| 63 | Powerful digit counts | 21 Sep 15 (14:05.59) |
| 317 | Firecracker | 16 Sep 15 (19:52.57) |
| 123 | Prime square remainders | 01 Jun 15 (22:23.18) |
| 69 | Totient maximum | 14 May 15 (15:36.02) |
| 85 | Counting rectangles | 26 Jan 15 (14:53.24) |
| 173 | Using up to one million tiles how many different "hollow" square laminae can be formed? | 20 Jan 15 (16:57.45) |
| 120 | Square remainders | 11 Nov 14 (23:56.04) |
| 117 | Red, green, and blue tiles | 30 Oct 14 (22:47.10) |
| 101 | Optimum polynomial | 25 Oct 14 (02:12.35) |
| 116 | Red, green or blue tiles | 07 Oct 14 (16:46.03) |
| 31 | Coin sums | 04 Oct 14 (22:36.33) |
| 58 | Spiral primes | 18 Sep 14 (20:38.35) |
| 166 | Criss Cross | 18 Sep 14 (13:14.15) |
| 87 | Prime power triples | 17 Sep 14 (13:53.35) |
| 57 | Square root convergents | 15 Sep 14 (23:55.41) |
| 46 | Goldbach's other conjecture | 15 Sep 14 (22:20.10) |
| 23 | Non-abundant sums | 15 Sep 14 (20:42.51) |
| 32 | Pandigital products | 15 Sep 14 (01:37.57) |
| 38 | Pandigital multiples | 14 Sep 14 (22:35.20) |
| 59 | XOR decryption | 12 Sep 14 (13:48.48) |
| 124 | Ordered radicals | 12 Sep 14 (11:33.36) |
| 41 | Pandigital prime | 10 Sep 14 (15:27.27) |
| 82 | Path sum: three ways | 29 Aug 14 (18:23.32) |
| 81 | Path sum: two ways | 28 Aug 14 (08:46.49) |
| 15 | Lattice paths | 14 Jun 14 (11:50.06) |
| 206 | Concealed Square | 01 Jun 14 (13:13.17) |
| 45 | Triangular, pentagonal, and hexagonal | 29 May 14 (10:55.54) |
| 112 | Bouncy numbers | 24 May 14 (18:41.56) |
| 52 | Permuted multiples | 24 May 14 (13:20.33) |
| 53 | Combinatoric selections | 20 May 14 (22:10.19) |
| 37 | Truncatable primes | 20 May 14 (19:36.04) |
| 55 | Lychrel numbers | 19 May 14 (23:43.55) |
| 99 | Largest exponential | 18 May 14 (00:24.01) |
| 74 | Digit factorial chains | 17 May 14 (23:43.17) |
| 89 | Roman numerals | 10 May 14 (20:08.42) |
| 28 | Number spiral diagonals | 10 May 14 (00:42.37) |
| 92 | Square digit chains | 06 May 14 (23:26.15) |
| 49 | Prime permutations | 06 May 14 (22:17.49) |
| 34 | Digit factorials | 01 May 14 (21:15.25) |
| 30 | Digit fifth powers | 01 May 14 (18:06.28) |
| 47 | Distinct primes factors | 26 Apr 14 (22:15.58) |
| 71 | Ordered fractions | 26 Apr 14 (15:37.18) |
| 102 | Triangle containment | 25 Apr 14 (18:26.01) |
| 26 | Reciprocal cycles | 21 Apr 14 (18:29.45) |
| 67 | Maximum path sum II | 15 Apr 14 (14:24.49) |
| 24 | Lexicographic permutations | 29 Mar 14 (12:03.16) |
| 35 | Circular primes | 02 Mar 14 (12:36.10) |
| 27 | Quadratic primes | 21 Feb 14 (12:32.55) |
| 39 | Integer right triangles | 23 Jan 14 (15:59.56) |
| 33 | Digit cancelling fractions | 29 Oct 13 (19:52.37) |
| 18 | Maximum path sum I | 25 Oct 13 (22:55.12) |
| 97 | Large non-Mersenne prime | 13 Oct 13 (14:44.45) |
| 56 | Powerful digit sum | 23 Sep 13 (12:34.24) |
| 54 | Poker hands | 21 Sep 13 (21:36.33) |
| 79 | Passcode derivation | 20 Sep 13 (18:45.13) |
| 43 | Sub-string divisibility | 20 Sep 13 (16:59.36) |
| 40 | Champernowne's constant | 30 Jul 13 (23:37.08) |
| 19 | Counting Sundays | 30 Jul 13 (23:13.17) |
| 29 | Distinct powers | 30 Jul 13 (15:19.06) |
| 42 | Coded triangle numbers | 27 Jul 13 (01:19.09) |
| 36 | Double-base palindromes | 26 Jul 13 (23:57.27) |
| 21 | Amicable numbers | 26 Jul 13 (18:05.51) |
| 14 | Longest Collatz sequence | 26 Jul 13 (00:34.55) |
| 22 | Names scores | 25 Jul 13 (01:08.30) |
| 12 | Highly divisible triangular number | 24 Jul 13 (23:17.03) |
| 17 | Number letter counts | 23 Jul 13 (14:43.06) |
| 11 | Largest product in a grid | 22 Jul 13 (21:21.40) |
| 16 | Power digit sum | 22 Jul 13 (13:47.49) |
| 9 | Special Pythagorean triplet | 21 Jul 13 (20:12.52) |
| 8 | Largest product in a series | 21 Jul 13 (18:20.15) |
| 4 | Largest palindrome product | 21 Jul 13 (16:06.38) |
| 3 | Largest prime factor | 21 Jul 13 (02:12.35) |
| 25 | 1000-digit Fibonacci number | 20 Jul 13 (22:56.18) |
| 10 | Summation of primes | 18 Jul 13 (23:56.04) |
| 7 | 10001st prime | 18 Jul 13 (23:48.58) |
| 13 | Large sum | 18 Jul 13 (22:01.14) |
| 48 | Self powers | 18 Jul 13 (15:25.38) |
| 20 | Factorial digit sum | 18 Jul 13 (15:00.53) |
| 2 | Even Fibonacci numbers | 18 Jul 13 (11:33.35) |
| 6 | Sum square difference | 09 Mar 13 (18:12.48) |
| 5 | Smallest multiple | Completed when dinosaurs roamed the earth. |
| 1 | Multiples of 3 or 5 | Completed a long, long time ago. |