Abundant Numbers
6th
brainfuck
20th
Christmas Trees
24th
Cubes
10th
Emirp Numbers
22nd
Evil Numbers
46th
Fibonacci
1st
Fizz Buzz
18th
Intersection
15th
Leap Years
71st
Niven Numbers
59th
Odious Numbers
41st
Ordinal Numbers
33rd
Pascal’s Triangle
14th
Pernicious Numbers
36th
Prime Numbers
47th
United States
16th