Abundant Numbers
17th
Arithmetic Numbers
10th
Catalan Numbers
17th
Divisors
47th
Evil Numbers
27th
Evil Numbers (Long)
21st
Fibonacci
24th
Fizz Buzz
15th
Foo Fizz Buzz Bar
13th
Happy Numbers
21st
Happy Numbers (Long)
17th
Leap Years
17th
Leyland Numbers
20th
Niven Numbers
8th
Niven Numbers (Long)
13th
Odious Numbers
1st
Odious Numbers (Long)
24th
Pascal’s Triangle
47th
Pernicious Numbers
27th
Prime Numbers
74th
Prime Numbers (Long)
64th
Smith Numbers
6th