12 Days of Christmas
99 Bottles of Beer
Abundant Numbers
Christmas Trees
Cubes
Diamonds
6th
Divisors
Emirp Numbers
Evil Numbers
14th
Fibonacci
15th
Fizz Buzz
81st
Happy Numbers
Happy Numbers (Long)
Kolakoski Constant
Kolakoski Sequence
8th
Leap Years
Leyland Numbers
Morse Decoder
Niven Numbers
Odious Numbers
Pangram Grep
Pernicious Numbers
Prime Numbers
19th
Quine
1st
Recamán
Rule 110
Smith Numbers
Star Wars Opening Crawl
Sudoku (Fill-in)
Vampire Numbers
Van Eck Sequence
λ
π
23rd
39th
11th
74th
87th
81st
17th
38th
37th
12th
39th
45th
12th
28th
77th
175th
90th
31st
37th
11th
65th
71st
29th
242nd
66th
108th
36th
12th
9th
8th
30th
τ
φ
√2
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