Abundant Numbers
17th
Arithmetic Numbers
9th
Catalan Numbers
16th
Divisors
45th
Evil Numbers
26th
Evil Numbers (Long)
20th
Fibonacci
24th
Fizz Buzz
14th
Foo Fizz Buzz Bar
13th
Happy Numbers
20th
Happy Numbers (Long)
16th
Leap Years
16th
Leyland Numbers
20th
Niven Numbers
7th
Niven Numbers (Long)
13th
Odious Numbers
1st
Odious Numbers (Long)
23rd
Pascal’s Triangle
47th
Pernicious Numbers
27th
Prime Numbers
72nd
Prime Numbers (Long)
62nd
Smith Numbers
6th