Abundant Numbers
730th
Arithmetic Numbers
564th
Card Number Validation
489th
Catalan Numbers
873rd
Christmas Trees
771st
Collatz
758th
CSS Colors
774th
Day of Week
329th
Emirp Numbers
1,623rd
Emirp Numbers (Long)
739th
Evil Numbers
2,554th
Fizz Buzz
18th
Leap Years
641st
Niven Numbers
2,355th
Pangram Grep
1,133rd
Prime Numbers
2,322nd
Tongue-twisters
1,483rd