Abundant Numbers
9th
Abundant Numbers (Long)
7th
Collatz
11th
Divisors
9th
Emirp Numbers
10th
Evil Numbers
9th
Evil Numbers (Long)
10th
Fibonacci
11th
Fizz Buzz
13th
Happy Numbers
10th
Leap Years
18th
Niven Numbers
7th
Niven Numbers (Long)
14th
Odious Numbers
9th
Odious Numbers (Long)
6th
Ordinal Numbers
5th
Pangram Grep
1st
Pernicious Numbers
16th
Prime Numbers
8th
United States
8th