Abundant Numbers
6th
brainfuck
17th
Christmas Trees
23rd
Cubes
5th
Emirp Numbers
21st
Evil Numbers
41st
Fibonacci
1st
Fizz Buzz
17th
Intersection
13th
Leap Years
60th
Niven Numbers
54th
Odious Numbers
40th
Ordinal Numbers
30th
Pascal’s Triangle
11th
Pernicious Numbers
32nd
Prime Numbers
43rd
United States
14th