Abundant Numbers
40th
141st
Abundant Numbers (Long)
19th9th53rd65th79th3rd
Collatz
45th
Divisors
11th47th88th125th5th
Evil Numbers
515th
Fibonacci
1st1st76th1st
8th
Leap Years
68th
306th
Niven Numbers (Long)
1st
Pangram Grep
39th
Prime Numbers
15th
Prime Numbers (Long)
15th
Roman to Arabic
17th
83rd