Abundant Numbers
5th
brainfuck
17th
Christmas Trees
23rd
Cubes
8th
Emirp Numbers
21st
Evil Numbers
41st
Fibonacci
1st
Fizz Buzz
17th
Intersection
13th
Leap Years
63rd
Niven Numbers
55th
Odious Numbers
40th
Ordinal Numbers
30th
Pascal’s Triangle
11th
Pernicious Numbers
33rd
Prime Numbers
45th
United States
14th