Abundant Numbers
33rd
136th
Abundant Numbers (Long)
19th8th31st63rd76th3rd
Collatz
36th
Divisors
10th43rd88th120th5th
Evil Numbers
507th
Fibonacci
1st1st68th1st
8th
Leap Years
61st
296th
Niven Numbers (Long)
1st
Pangram Grep
39th
Prime Numbers
14th
Prime Numbers (Long)
14th
Roman to Arabic
15th
80th