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| # | Name | + | Explanation | py |
|---|---|---|---|---|
| bonus | root13 | Fisrt bonus problem solved! | 📄 | ✓ |
| 944 | Sum of Elevisors | 724th user to solve! | 📄 | ✓ |
| 151 | A Preference for A5 | Difficulty: 50% | 📄 | ✓ |
| 165 | Intersections | Difficulty: 65% | 📄 | ✓ |
| # | Name | Explanation | py |
|---|---|---|---|
| 1 | Multiples of 3 or 5 | 📄 | ✓ |
| 2 | Even Fibonacci Numbers | 📄 | ✓ |
| 3 | Largest Prime Factor | 📄 | ✓ |
| 4 | Largest Palindrome Product | 📄 | ✓ |
| 5 | Smallest Multiple | 📄 | ✓ |
| 6 | Sum Square Difference | 📄 | ✓ |
| 7 | 10 001st Prime | 📄 | ✓ |
| 8 | Largest Product in a Series | 📄 | ✓ |
| 9 | Special Pythagorean Triplet | 📄 | ✓ |
| 10 | Summation of Primes | 📄 | ✓ |
| 11 | Largest Product in a Grid | 📄 | ✓ |
| 12 | Highly Divisible Triangular Number | 📄 | ✓ |
| 13 | Large Sum | 📄 | ✓ |
| 14 | Longest Collatz Sequence | 📄 | ✓ |
| 15 | Lattice Paths | 📄 | ✓ |
| 16 | Power Digit Sum | 📄 | ✓ |
| 17 | Number Letter Counts | 📄 | ✓ |
| 18 | Maximum Path Sum I | 📄 | ✓ |
| 19 | Counting Sundays | 📄 | ✓ |
| 20 | Factorial Digit Sum | 📄 | ✓ |
| 21 | Amicable Numbers | 📄 | ✓ |
| 22 | Names Scores | 📄 | ✓ |
| 23 | Non-Abundant Sums | 📄 | ✓ |
| 24 | Lexicographic Permutations | 📄 | ✓ |
| 25 | 1000-digit Fibonacci Number | 📄 | ✓ |
| 26 | Reciprocal Cycles | 📄 | ✓ |
| 27 | Quadratic Primes | 📄 | ✓ |
| 28 | Number Spiral Diagonals | 📄 | ✓ |
| 29 | Distinct Powers | 📄 | ✓ |
| 30 | Digit Fifth Powers | 📄 | ✓ |
| 31 | Coin Sums | 📄 | ✓ |
| 32 | Pandigital Products | 📄 | ✓ |
| 33 | Digit Cancelling Fractions | 📄 | ✓ |
| 34 | Digit Factorials | 📄 | ✓ |
| 35 | Circular Primes | 📄 | ✓ |
| 36 | Double-base Palindromes | 📄 | ✓ |
| 37 | Truncatable Primes | 📄 | ✓ |
| 38 | Pandigital Multiples | 📄 | ✓ |
| 39 | Integer Right Triangles | 📄 | ✓ |
| 40 | Champernowne's Constant | 📄 | ✓ |
| 41 | Pandigital Prime | 📄 | ✓ |
| 42 | Coded Triangle Numbers | 📄 | ✓ |
| 43 | Sub-string Divisibility | 📄 | ✓ |
| 44 | Pentagon Numbers | 📄 | ✓ |
| 45 | Triangular, Pentagonal, and Hexagonal | 📄 | ✓ |
| 46 | Goldbach's Other Conjecture | 📄 | ✓ |
| 47 | Distinct Primes Factors | 📄 | ✓ |
| 48 | Self Powers | 📄 | ✓ |
| 49 | Prime Permutations | 📄 | ✓ |
| 50 | Consecutive Prime Sum | 📄 | ✓ |
| 52 | Permuted Multiples | 📄 | ✓ |
| 53 | Combinatoric Selections | 📄 | ✓ |
| 54 | Poker Hands | 📄 | ✓ |
| 55 | Lychrel Numbers | 📄 | ✓ |
| 56 | Powerful Digit Sum | 📄 | ✓ |
| 57 | Square Root Convergents | 📄 | ✓ |
| 58 | Spiral Primes | 📄 | ✓ |
| 59 | XOR Decryption | 📄 | ✓ |
| 62 | Permuted Multiples | 📄 | ✓ |
| 63 | Powerful Digit Counts | 📄 | ✓ |
| 64 | Odd Period Square Roots | 📄 | ✓ |
| 65 | Convergents of e | 📄 | ✓ |
| 67 | Maximum Path Sum II | 📄 | ✓ |
| 68 | Magic 5-gon Ring | 📄 | ✓ |
| 69 | Totient Maximum | 📄 | ✓ |
| 71 | Ordered Fractions | 📄 | ✓ |
| 73 | Counting Fractions in a Range | 📄 | ✓ |
| 74 | Digit Factorial Chains | 📄 | ✓ |
| 76 | Counting Summations | 📄 | ✓ |
| 78 | Coin Partitions | 📄 | ✓ |
| 79 | Passcode Derivation | 📄 | ✓ |
| 80 | Square Root Digital Expansion | 📄 | ✓ |
| 81 | Path Sum: Two Ways | 📄 | ✓ |
| 82 | Path Sum: Three Ways | 📄 | ✓ |
| 83 | Path Sum: Four Ways | 📄 | ✓ |
| 85 | Counting Rectangles | 📄 | ✓ |
| 86 | Cuboid Route | 📄 | ✓ |
| 87 | Prime Power Triples | 📄 | ✓ |
| 89 | Roman Numerals | 📄 | ✓ |
| 90 | Cube Digit Pairs | 📄 | ✓ |
| 91 | Right Triangles with Integer Coordinates | 📄 | ✓ |
| 92 | Square Digit Chains | 📄 | ✓ |
| 96 | Su Doku | 📄 | ✓ |
| 97 | Large Non-Mersenne Prime | 📄 | ✓ |
| 99 | Largest Exponential | 📄 | ✓ |
| 100 | Arranged Probability | 📄 | ✓ |
| 102 | Triangle Containment | 📄 | ✓ |
| 104 | Pandigital Fibonacci Ends | 📄 | ✓ |
| 107 | Minimal Network | 📄 | ✓ |
| 112 | Bouncy Numbers | 📄 | ✓ |
| 116 | Red, Green or Blue Tiles | 📄 | ✓ |
| 117 | Red, Green and Blue Tiles | 📄 | ✓ |
| 123 | Prime Square Remainders | 📄 | ✓ |
| 124 | Ordered Radicals | 📄 | ✓ |
| 125 | Palindromic Sums | 📄 | ✓ |
| 145 | Reversible Numbers | 📄 | ✓ |
| 151 | A Preference for A5 | 📄 | ✓ |
| 165 | Intersections | 📄 | ✓ |
| 173 | Hollow Square Laminae I | 📄 | ✓ |
| 179 | Consecutive Positive Divisors | 📄 | ✓ |
| 205 | Dice Game | 📄 | ✓ |
| 206 | Concealed Square | 📄 | ✓ |
| 504 | Square on the Inside | 📄 | ✓ |
| 587 | Concave Triangle | 📄 | ✓ |
| 686 | Powers of Two | 📄 | ✓ |
| 808 | Reversible Prime Squares | 📄 | ✓ |
| 836 | A Bold Proposition | 📄 | |
| 944 | Sum of Elevisors | 📄 | ✓ |

