Abundant Numbers
785
Arithmetic Numbers
781
Card Number Validation
569
Catalan Numbers
659
Christmas Trees
717
Collatz
826
CSS Colors
255
Day of Week
901
Emirp Numbers
496
Emirp Numbers (Long)
522
Evil Numbers
640
Fizz Buzz
986
Leap Years
868
Niven Numbers
653
Pangram Grep
678
Prime Numbers
647
Tongue-twisters
511