Abundant Numbers
4th
brainfuck
17th
Christmas Trees
23rd
Cubes
8th
Emirp Numbers
20th
Evil Numbers
38th
Fibonacci
1st
Fizz Buzz
17th
Intersection
12th
Leap Years
60th
Niven Numbers
49th
Odious Numbers
36th
Ordinal Numbers
29th
Pascalβs Triangle
9th
Pernicious Numbers
28th
Prime Numbers
41st
United States
14th