Abundant Numbers
40th
143rd
Abundant Numbers (Long)
19th10th52nd67th79th3rd
Collatz
45th
Divisors
11th48th88th125th5th
Evil Numbers
518th
Fibonacci
1st1st79th1st
9th
Leap Years
69th
308th
Niven Numbers (Long)
1st
Pangram Grep
40th
Prime Numbers
16th
Prime Numbers (Long)
16th
Roman to Arabic
17th
83rd