Abundant Numbers
4th
brainfuck
17th
Christmas Trees
23rd
Cubes
8th
Emirp Numbers
21st
Evil Numbers
40th
Fibonacci
1st
Fizz Buzz
17th
Intersection
12th
Leap Years
60th
Niven Numbers
52nd
Odious Numbers
38th
Ordinal Numbers
30th
Pascal’s Triangle
11th
Pernicious Numbers
31st
Prime Numbers
42nd
United States
14th