12 Days of Christmas
21st
99 Bottles of Beer
13th
Abundant Numbers
18th
brainfuck
10th
Christmas Trees
23rd
Diamonds
12th
Divisors
6th
Emirp Numbers
12th
Evil Numbers
34th
Fibonacci
71st
Fizz Buzz
97th
Leap Years
41st
Niven Numbers
35th
Odious Numbers
33rd
Ordinal Numbers
14th
Pangram Grep
30th
Pascal’s Triangle
18th
Pernicious Numbers
34th
Prime Numbers
12th
Quine
8th
United States
10th