Abundant Numbers
4th
brainfuck
17th
Christmas Trees
23rd
Cubes
8th
Emirp Numbers
20th
Evil Numbers
40th
Fibonacci
1st
Fizz Buzz
17th
Intersection
12th
Leap Years
60th
Niven Numbers
51st
Odious Numbers
38th
Ordinal Numbers
29th
Pascal’s Triangle
9th
Pernicious Numbers
30th
Prime Numbers
42nd
United States
14th