Tackling Project Euler's weekly problems, one by one.
Also used as a playground for learning Elixir (and maybe some other languages).
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| ID | Description / Title | Difficulty | Computational time |
|---|---|---|---|
| 001 | Multiples of 3 and 5 | 5% | 0.738 s |
| 002 | Even Fibonacci numbers | 5% | 0.414 s |
| 003 | Largest prime factor | 5% | 0.421 s |
| 004 | Largest palindrome product | 5% | 1.466 s |
| 005 | Smallest multiple | 5% | 28.421 s |
| 006 | Sum square difference | 5% | 0.431 s |
| 007 | 10001st prime | 5% | 0.973 s |
| 008 | Largest product in a series | 5% | 0.366 s |
| 009 | Special Pythagorean triplet | 5% | 0.532 s |
| 010 | Summation of primes | 5% | 22.129 s |
| 011 | Largest product in a grid | 5% | 0.778 s |
| 012 | Highly divisible triangular number | 5% | 1.144 s |
| 013 | Large sum | 5% | 0.392 s |
| 014 | Longest Collatz sequence | 5% | 8.741 s |
| 015 | Lattice paths | 5% | 0.756 s |
| 016 | Power digit sum | 5% | 0.438 s |
| 017 | Number letter counts | 5% | 0.426 s |
| 018 | Maximum path sum I | 5% | 0.566 s |
| 019 | Counting Sundays | 5% | 0.530 s |
| 020 | Factorial digit sum | 5% | 0.393 s |
| 021 | Amicable numbers | 5% | 2.855 s |
| 022 | Names scores | 5% | 0.391 s |
| 023 | Non-abundant sums | 5% | 2 min 51.632 s |
| 024 | Lexicographic permutations | 5% | 0.498 s |
| 025 | 1000-digit Fibonacci number | 5% | 4.450 s |
| 026 | Reciprocal cycles | 5% | 5.300 s |
| 027 | Quadratic primes | 5% | 55.706 s |
| 028 | Number spiral diagonals | 5% | 0.375 s |
| 029 | Distinct powers | 5% | 0.394 s |
| 030 | Digit fifth powers | 5% | 0.758 s |
| 031 | Coin sums | 5% | 10 min 23.920 s |
| 032 | Pandigital products | 5% | 21.188 s |
| 033 | Digit cancelling fractions | 5% | 0.776 s |
| 034 | Digit factorials | 5% | 0.466 s |
| 035 | Circular primes | 5% | 11.197 s |
| 036 | Double-base palindromes | 5% | 2.106 s |
| 037 | Truncatable primes | 5% | 8.696 s |
| 038 | Pandigital multiples | 5% | 0.864 s |
| 039 | Integer right triangles | 5% | 21.257 s |
| 040 | Champernowne's constant | 5% | 0.978 s |
| 041 | Pandigital primes | 5% | 0.714 s |
| 042 | Coded triangle numbers | 5% | 0.379 s |
| 043 | Sub-string divisibility | 5% | 15.714 s |
| 044 | Pentagon numbers | 5% | 1.798 s |
| 045 | Triangular, pentagonal, and hexagonal | 5% | 0.429 s |
| 046 | Goldbach's other conjecture | 5% | 0.484 s |
| 047 | Distinct primes factors | 5% | 33.148 s |
| 048 | Self powers | 5% | 0.532 s |
| 049 | Prime permutations | 5% | 0.441 s |
| 050 | Consecutive prime sum | 5% | 25.386 s |
| 052 | Permuted multiples | 5% | 1.490 s |
| 053 | Combinatoric selections | 5% | 0.670 s |
| 054 | Poker hands | 10% | 0.593 s |
| 055 | Lychrel numbers | 5% | 0.630 s |
| 056 | Powerful digit sum | 5% | 0.749 s |
| 057 | Square root convergents | 5% | 1.271 s |
| 058 | Spiral primes | 5% | 14.554 s |
| 059 | XOR decryption | 5% | 4.338 s |
| 062 | Cubic permutations | 15% | 4.100 s |
| 063 | Powerful digit counts | 5% | 0.570 s |
| 074 | Digit factorial chains | 15% | 56.409 s |
| 089 | Roman numerals | 20% | 0.508 s |
| 092 | Square digit chains | 5% | 25.55 s |
| 097 | Large non-Mersenne prime | 5% | 0.480 s |
| 102 | Triangle containment | 15% | 0.373 s |
| 104 | Pandigital Fibonacci ends | 25% | 6 min 40.04 s |
| 112 | Bouncy numbers | 15% | 11.936 s |
| 144 | Investigating multiple reflections of a laser beam | 50% | 0.393 s |
| 145 | How many reversible numbers are there below one-billion? | 20% | 30 min 32.579 s |
| 206 | Concealed Square | 5% | 3 min 17.635 s |
| 686 | Powers of Two | 5% | 207.87 s |
| 719 | Number Splitting | 5% | 201.44 min |
