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

    janlelis

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    12 Days of Christmas
    7th
    99 Bottles of Beer
    131st 151st💎
    Abundant Numbers
    18th26th 214th14th
    Abundant Numbers (Long)
    158th3rd
    Arithmetic Numbers
    4th
    Ascending Primes
    7th
    ASCII Table
    4th
    brainfuck
    2nd
    Card Number Validation
    19th
    Catalan Numbers
    34th
    Christmas Trees
    7th
    Collatz
    11th
    Day of Week
    1st
    Diamonds
    10th
    Divisors
    26th86th9th118th4th
    Emirp Numbers
    5th
    Emirp Numbers (Long)
    5th
    Emojify
    10th
    Evil Numbers
    28th63rd 250th12th
    Evil Numbers (Long)
    38th15th
    Factorial Factorisation
    5th
    Farey Sequence
    1st
    Fibonacci
    186th7th
    Fizz Buzz
    9th
    Foo Fizz Buzz Bar
    4th
    Forsyth–Edwards Notation
    5th
    Fractions
    92nd1st
    Happy Numbers
    9th 14th
    Happy Numbers (Long)
    2nd
    Hexdump
    10th
    Inventory Sequence
    15th
    ISBN
    9th
    Jacobi Symbol
    7th
    Kolakoski Constant
    8th
    Kolakoski Sequence
    18th
    Leap Years
    18th59th7th54th3rd
    Leyland Numbers
    43rd 4th
    ln 2
    1st
    Look and Say
    10th
    Lucky Numbers
    10th
    Medal Tally
    14th
    Musical Chords
    10th
    Niven Numbers
    1st 144th29th
    Niven Numbers (Long)
    1st
    Number Spiral
    5th
    Odious Numbers
    60th 144th12th
    Odious Numbers (Long)
    81st12th
    Ordinal Numbers
    56th 2nd
    PalindromemordnilaP
    Pangram Grep
    5th
    Pascal’s Triangle
    80th 3rd
    Pernicious Numbers
    55th 77th40th
    Pernicious Numbers (Long)
    6th
    Prime Numbers
    77th 11th
    Prime Numbers (Long)
    1st
    Quine
    34th
    Recamán
    8th
    Reverse Polish Notation
    7th
    ROT13
    104th1st
    Rule 110
    21st
    Scrambled Sort
    24th
    Seven Segment
    23rd
    Sierpiński Triangle
    53rd 18th
    Smith Numbers
    5th
    Spelling Numbers
    3rd30th 63rd5th
    Tongue-twisters
    6th
    Transpose Sentence
    5th
    United States
    58th 10th
    Van Eck Sequence
    16th 1st
    π
    8th
    τ
    10th
    φ
    21st
    √2
    14th
    𝑒
    10th