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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
    433rd
    99 Bottles of Beer
    557th 357th85th
    Abundant Numbers
    634th504th 1,386th284th
    Abundant Numbers (Long)
    635th537th
    Arithmetic Numbers
    347th
    Ascending Primes
    244th
    ASCII Table
    147th
    brainfuck
    103rd
    Card Number Validation
    453rd
    Catalan Numbers
    438th
    Christmas Trees
    38th
    Collatz
    274th
    Day of Week
    197th
    Diamonds
    432nd
    Divisors
    1,771st1,872nd1,269th28th415th
    Emirp Numbers
    586th
    Emirp Numbers (Long)
    155th
    Emojify
    214th
    Evil Numbers
    1,272nd1,106th 853rd394th
    Evil Numbers (Long)
    112th1,009th
    Factorial Factorisation
    11th
    Farey Sequence
    34th
    Fibonacci
    1,233rd1,168th
    Fizz Buzz
    4,305th
    Foo Fizz Buzz Bar
    546th
    Forsyth–Edwards Notation
    8th
    Fractions
    151st10th
    Happy Numbers
    814th 158th
    Happy Numbers (Long)
    72nd
    Hexdump
    63rd
    Inventory Sequence
    543rd
    ISBN
    533rd
    Jacobi Symbol
    397th
    Kolakoski Constant
    88th
    Kolakoski Sequence
    569th
    Leap Years
    1,102nd155th967th623rd1,255th
    Leyland Numbers
    868th 180th
    ln 2
    93rd
    Look and Say
    166th
    Lucky Numbers
    306th
    Medal Tally
    367th
    Musical Chords
    213th
    Niven Numbers
    114th 1,091st1,380th
    Niven Numbers (Long)
    88th
    Number Spiral
    264th
    Odious Numbers
    1,127th 877th290th
    Odious Numbers (Long)
    161st967th
    Ordinal Numbers
    185th 96th
    PalindromemordnilaP
    Pangram Grep
    421st
    Pascal’s Triangle
    1,246th 135th
    Pernicious Numbers
    1,691st 1,215th1,192nd
    Pernicious Numbers (Long)
    168th
    Prime Numbers
    1,170th 230th
    Prime Numbers (Long)
    313th
    Quine
    5,168th
    Recamán
    226th
    Reverse Polish Notation
    194th
    ROT13
    130th64th
    Rule 110
    437th
    Scrambled Sort
    363rd
    Seven Segment
    637th
    Sierpiński Triangle
    855th 329th
    Smith Numbers
    195th
    Spelling Numbers
    166th101st 373rd145th
    Tongue-twisters
    533rd
    Transpose Sentence
    134th
    United States
    241st 217th
    Van Eck Sequence
    220th 60th
    π
    465th
    τ
    482nd
    φ
    644th
    √2
    488th
    𝑒
    329th