Abundant Numbers
39th
138th
Abundant Numbers (Long)
19th8th52nd64th78th3rd
Collatz
40th
Divisors
10th45th88th123rd5th
Evil Numbers
513th
Fibonacci
1st1st75th1st
8th
Leap Years
66th
301st
Niven Numbers (Long)
1st
Pangram Grep
39th
Prime Numbers
14th
Prime Numbers (Long)
14th
Roman to Arabic
15th
81st