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

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    25 / 123 Holes

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    1 / 62 Langs

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    Abundant Numbers
    514th
    Abundant Numbers (Long)
    329th
    Catalan Numbers
    111th
    Christmas Trees
    617th
    Collatz
    381st
    Day of Week
    141st
    Emirp Numbers
    453rd
    Emirp Numbers (Long)
    219th
    Evil Numbers
    566th
    Evil Numbers (Long)
    351st
    Fibonacci
    1st
    Fizz Buzz
    195th
    Foo Fizz Buzz Bar
    356th
    Game of Life
    119th
    Happy Numbers
    533rd
    ISBN
    288th
    Leap Years
    293rd
    Niven Numbers
    588th
    Niven Numbers (Long)
    313th
    Odious Numbers
    512th
    Odious Numbers (Long)
    305th
    PalindromemordnilaP
    81st
    Prime Numbers
    719th
    Prime Numbers (Long)
    382nd
    Recamán
    229th