12 Days of Christmas
531st
Abundant Numbers
631st
Abundant Numbers (Long)
327th
Collatz
572nd
Day of Week
269th
Evil Numbers
912th
Evil Numbers (Long)
440th
Fibonacci
1,764th
Fizz Buzz
2,791st
Happy Numbers (Long)
292nd
Hexdump
161st
ISBN
266th
Leap Years
1,030th
ln 2
110th
Look and Say
338th
Niven Numbers
818th
Niven Numbers (Long)
420th
Odious Numbers
693rd
Odious Numbers (Long)
364th
PalindromemordnilaP
Pernicious Numbers
566th
Tongue-twisters
316th