Abundant Numbers
791
Arithmetic Numbers
794
Card Number Validation
576
Catalan Numbers
665
Christmas Trees
722
Collatz
831
CSS Colors
123
Day of Week
900
Emirp Numbers
440
Emirp Numbers (Long)
528
Evil Numbers
642
Fizz Buzz
989
Leap Years
871
Niven Numbers
659
Pangram Grep
684
Prime Numbers
648
Tongue-twisters
342