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

    Lewenhaupt

    7,195
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    6,681
    🥇0
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    🥈0
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    ⛳

    10 / 123 Holes

    🔣

    1 / 62 Langs

    🏆

    5 / 99 Cheevos

    📅

    Collatz
    141st
    Emirp Numbers
    257th
    Happy Numbers
    315th
    Leap Years
    1,098th
    Niven Numbers
    75th
    Niven Numbers (Long)
    42nd
    Pascal’s Triangle
    424th
    Pernicious Numbers
    192nd
    Recamán
    60th
    Van Eck Sequence
    73rd