Abundant Numbers
790
Arithmetic Numbers
792
Card Number Validation
572
Catalan Numbers
664
Christmas Trees
721
Collatz
845
CSS Colors
123
Day of Week
895
Emirp Numbers
439
Emirp Numbers (Long)
526
Evil Numbers
642
Fizz Buzz
989
Leap Years
892
Niven Numbers
659
Pangram Grep
683
Prime Numbers
647
Tongue-twisters
341