12 Days of Christmas
14th
99 Bottles of Beer
9th
Abundant Numbers
17th
brainfuck
Christmas Trees
11th
Cubes
9th
Diamonds
8th
Divisors
18th
Emirp Numbers
31st
Evil Numbers
40th
Fibonacci
18th102nd
Fizz Buzz
9th
Lucky Tickets
Morse Decoder
8th
Niven Numbers
25th
Odious Numbers
34th
Pangram Grep
12th
Pernicious Numbers
39th
Prime Numbers
55th
United States
18th
π
16th
τ
15th
φ
23rd
√2
30th