Arithmetic Numbers
8th
Card Number Validation
5th
Collatz
12th
Divisors
26th
Evil Numbers
1st
Evil Numbers (Long)
1st
Leap Years
16th
Leyland Numbers
17th
Look and Say
8th
Niven Numbers
26th
Niven Numbers (Long)
24th
Odious Numbers
1st
Odious Numbers (Long)
1st
Pernicious Numbers
26th
Pernicious Numbers (Long)
15th
Prime Numbers
1st
1st
Prime Numbers (Long)
1st
Smith Numbers
15th
United States
3rd
π
75th