Primal Sums | 209 | |

Protein folding | 176 | |

Word Search | 142 | |

Sums of powers | 135 | |

Coins | 123 | |

Minimal Sudoku | 117 | |

Maximal determinant | 91 | |

The Heilbronn Problem | 90 | |

Samegame | 87 | |

Packing spheres into a cube | 69 | |

Weighted Matrix | 68 | |

Rubik's cubes | 64 | |

Crossword Grids | 61 | |

Error correcting code | 49 | |

Deterministic pancake flipping | 42 | |

Miller Rabin | 42 | |

Packing with consecutive squares | 40 | |

Orchard planting | 38 | |

Sum Of Unequal Powers (SOUP) | 36 | |

Leapers coverings | 35 | |

Taxicab Numbers | 32 | |

Non Transitive Dice | 24 | |

Different determinants | 21 | |

Heilbronn 3D | 21 | |

Packing with cubes | 21 | |

Crossing Number | 20 | |

Fifteen puzzle | 19 | |

Unique vectors | 18 | |

No 3 in line, in d dimensions | 18 | |

3D Magic Knight Tours | 16 | |

Packing Equations Into A Square | 15 | |

Perfect rulers | 15 | |

Divisor chains | 13 | |

Tilings with squares as possible | 12 | |

Halving lines | 12 | |

Magic AntiMagic Squares | 11 | |

Minimal generating set size | 11 | |

Necklace | 10 | |

Pandigital Magic Squares | 10 | |

Snake and coil | 10 | |

Non-crossing leapers tours | 9 | |

G(m,n) | 8 | |

Number of lines | 8 | |

3*3 determinants | 8 | |

Trimagic squares | 7 | |

Weak Schur | 7 | |

Packing with multiple consecutive cubes | 6 | |

Graceful graphs | 5 | |

Coloring the square | 5 | |

Ellipses | 5 | |

Permanents of matrices | 4 | |