Abundant Numbers
31st
134th
Abundant Numbers (Long)
19th8th30th63rd75th3rd
Collatz
36th
Divisors
10th42nd88th119th4th
Evil Numbers
504th
Fibonacci
1st1st65th1st
8th
Leap Years
61st
295th
Niven Numbers (Long)
1st
Pangram Grep
39th
Prime Numbers
13th
Prime Numbers (Long)
13th
Roman to Arabic
15th
79th