Abundant Numbers
6th
brainfuck
15th
Christmas Trees
19th
Cubes
4th
Emirp Numbers
15th
Evil Numbers
34th
Fibonacci
1st
Fizz Buzz
16th
Intersection
9th
Leap Years
55th
Niven Numbers
47th
Odious Numbers
32nd
Ordinal Numbers
26th
Pascalβs Triangle
7th
Pernicious Numbers
26th
Prime Numbers
40th
United States
13th