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    The Calendar hole will go live in approximately . Why not try and solve it ahead of time?

    Recent Solutions

    Hole Golfer Chars Time Submitted
    Hexagonal Spiral bitsandbeyond 261
    Number Spiral HumanoidCPU 140
    Kolakoski Sequence HumanoidCPU 170
    Van Eck Sequence HumanoidCPU 161
    99 Bottles of Beer HumanoidCPU 527
    Recamán HumanoidCPU 156
    Roman to Arabic HumanoidCPU 247
    Smith Numbers HumanoidCPU 417
    Odious Numbers dokutan 72
    Evil Numbers dokutan 72
    Emojify dokutan 133
    Pernicious Numbers snoozingnewt 51
    Hexagonal Spiral HumanoidCPU 1,143
    Rule 110 HumanoidCPU 10,108
    Polyominoes HumanoidCPU 3,572
    Niven Numbers snoozingnewt 47
    Sierpiński Triangle dokutan 187
    Mandelbrot dokutan 340
    Apéry’s Constant HumanoidCPU 1,009
    Tower of Hanoi KatieLG 4,095
    Tower of Hanoi HumanoidCPU 92
    Happy Numbers snoozingnewt 80
    Tower of Hanoi dokutan 71
    𝑒 BREMAUCY 1,009
    Taxicab Numbers HumanoidCPU 4,168
    Emirp Numbers (Long) dokutan 132
    Taxicab Numbers Shanethegamer 4,168
    Smooth Numbers Shanethegamer 85
    Tutorial MeWhenI 65
    Arithmetic Numbers HumanoidCPU 103
    Smooth Numbers GolfingSuccess 84
    ISBN HumanoidCPU 112
    Leap Years HumanoidCPU 60
    Prime Numbers HumanoidCPU 71
    Prime Numbers (Long) HumanoidCPU 72
    𝑒 KatieLG 1,011
    √2 KatieLG 1,011
    φ KatieLG 1,011
    τ KatieLG 1,011
    π KatieLG 1,011
    λ KatieLG 1,011
    γ KatieLG 1,011
    Van Eck Sequence KatieLG 3,562
    Vampire Numbers KatieLG 1,233
    Trinomial Triangle KatieLG 2,094
    Tongue-twisters KatieLG 544
    Sphenic Numbers KatieLG 10,667
    Smith Numbers KatieLG 2,207
    Sierpiński Triangle KatieLG 415
    Semiprime Numbers KatieLG 15,421
    Rule 110 KatieLG 10,207
    Rijndael S-box KatieLG 791
    Recamán KatieLG 1,154
    Prime Numbers (Long) KatieLG 7,184
    Prime Numbers KatieLG 103
    Polyominoes KatieLG 4,837
    Polygon Triangulations KatieLG 4,515
    Pernicious Numbers (Long) KatieLG 24,921
    Pernicious Numbers KatieLG 142
    Pascal’s Triangle KatieLG 796
    Partition Numbers KatieLG 754
    Odious Numbers (Long) KatieLG 2,452
    Odious Numbers KatieLG 106
    Odd Polyomino Tiling KatieLG 21,645
    Number Spiral KatieLG 317
    Niven Numbers (Long) KatieLG 8,983
    Niven Numbers KatieLG 131
    N Queens KatieLG 1,401
    Mandelbrot KatieLG 3,410
    Lucky Numbers KatieLG 5,827
    Look and Say KatieLG 1,306
    ln 2 KatieLG 1,011
    Leyland Numbers KatieLG 1,000
    Leap Years KatieLG 883
    Kolakoski Sequence KatieLG 2,008
    Kolakoski Constant KatieLG 1,011
    Kaprekar Numbers KatieLG 515
    Inventory Sequence KatieLG 3,630
    Hilbert Curve KatieLG 2,087
    Highly Composite Numbers KatieLG 460