Abundant Numbers
47th
147th
Abundant Numbers (Long)
19th11th54th71st83rd3rd
Collatz
48th
Divisors
13th52nd88th126th5th
Evil Numbers
531st
Fibonacci
1st1st87th1st
10th
Leap Years
76th
317th
Niven Numbers (Long)
1st
Pangram Grep
41st
Prime Numbers
16th
Prime Numbers (Long)
16th
Roman to Arabic
20th
85th