Abundant Numbers
6th
brainfuck
15th
Christmas Trees
21st
Cubes
4th
Emirp Numbers
16th
Evil Numbers
35th
Fibonacci
1st
Fizz Buzz
16th
Intersection
9th
Leap Years
56th
Niven Numbers
47th
Odious Numbers
33rd
Ordinal Numbers
27th
Pascalβs Triangle
7th
Pernicious Numbers
27th
Prime Numbers
40th
United States
13th