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

    beergit

    4,967
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    4,644
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    9 / 123 Holes

    🔣

    1 / 62 Langs

    🏆

    4 / 99 Cheevos

    📅

    Catalan Numbers
    390
    Collatz
    681
    Emirp Numbers (Long)
    500
    Factorial Factorisation
    534
    Foo Fizz Buzz Bar
    390
    Happy Numbers (Long)
    413
    Niven Numbers (Long)
    864
    Odious Numbers (Long)
    569
    Pernicious Numbers (Long)
    519