Abundant Numbers
794
Arithmetic Numbers
793
Card Number Validation
574
Catalan Numbers
664
Christmas Trees
724
Collatz
849
CSS Colors
260
Day of Week
896
Emirp Numbers
499
Emirp Numbers (Long)
527
Evil Numbers
642
Fizz Buzz
992
Leap Years
893
Niven Numbers
662
Pangram Grep
685
Prime Numbers
648
Tongue-twisters
516