Abundant Numbers
8th
brainfuck
17th
Christmas Trees
23rd
Cubes
7th
Emirp Numbers
21st
Evil Numbers
43rd
Fibonacci
1st
Fizz Buzz
17th
Intersection
13th
Leap Years
65th
Niven Numbers
56th
Odious Numbers
41st
Ordinal Numbers
31st
Pascal’s Triangle
11th
Pernicious Numbers
34th
Prime Numbers
46th
United States
14th