12 Days of Christmas
13th7th
99 Bottles of Beer
28th
Abundant Numbers
44th
brainfuck
4th
Christmas Trees
23rd
Cubes
17th
Divisors
21st58th
Emirp Numbers
16th
Emojify
13th
Evil Numbers
24th41st
Fibonacci
112th16th46th
Fizz Buzz
38th106th
Leap Years
24th
Leyland Numbers
9th
Niven Numbers
39th
Odious Numbers
25th40th
Pernicious Numbers
50th
Prime Numbers
36th45th
Rule 110
11th
Spelling Numbers
8th
Sudoku
7th
π
56th