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

    mamalakic

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    11 / 123 Holes

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    1 / 62 Langs

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    10 / 99 Cheevos

    📅

    Collatz
    158th
    Fizz Buzz
    150th
    Leap Years
    259th
    Niven Numbers
    109th
    Niven Numbers (Long)
    71st
    Odious Numbers
    170th
    Odious Numbers (Long)
    97th
    Ordinal Numbers
    67th
    Pangram Grep
    54th
    Prime Numbers
    214th
    Prime Numbers (Long)
    105th