12 Days of Christmas
13th
5th
99 Bottles of Beer
22nd
Abundant Numbers
31st
brainfuck
4th
Christmas Trees
19th
Cubes
15th
Divisors
19th
40th
Emirp Numbers
11th
Emojify
11th
Evil Numbers
19th
31st
Fibonacci
85th
13th
30th
Fizz Buzz
31st
85th
Leap Years
21st
Leyland Numbers
5th
Niven Numbers
28th
Odious Numbers
20th
29th
Pernicious Numbers
39th
Prime Numbers
27th
34th
Rule 110
10th
Spelling Numbers
6th
Sudoku
8th
π
44th