Abundant Numbers
36th
137th
Abundant Numbers (Long)
19th8th50th63rd78th3rd
Collatz
38th
Divisors
10th44th88th121st5th
Evil Numbers
511th
Fibonacci
1st1st72nd1st
8th
Leap Years
65th
299th
Niven Numbers (Long)
1st
Pangram Grep
39th
Prime Numbers
14th
Prime Numbers (Long)
14th
Roman to Arabic
15th
81st