12 Days of Christmas
13th8th
99 Bottles of Beer
29th
Abundant Numbers
45th
brainfuck
4th
Christmas Trees
23rd
Cubes
17th
Divisors
22nd61st
Emirp Numbers
16th
Emojify
14th
Evil Numbers
24th43rd
Fibonacci
117th17th43rd
Fizz Buzz
38th109th
Leap Years
25th
Leyland Numbers
9th
Niven Numbers
40th
Odious Numbers
25th40th
Pernicious Numbers
52nd
Prime Numbers
37th46th
Rule 110
11th
Spelling Numbers
8th
Sudoku
7th
π
58th