12 Days of Christmas
18th
99 Bottles of Beer
13th
Abundant Numbers
15th
brainfuck
8th
Christmas Trees
19th
Diamonds
10th
Divisors
2nd
Emirp Numbers
10th
Evil Numbers
30th
Fibonacci
63rd
Fizz Buzz
91st
Leap Years
39th
Niven Numbers
29th
Odious Numbers
29th
Ordinal Numbers
12th
Pangram Grep
24th
Pascalβs Triangle
17th
Pernicious Numbers
28th
Prime Numbers
9th
Quine
8th
United States
9th