Abundant Numbers
785
Arithmetic Numbers
781
Card Number Validation
569
Catalan Numbers
658
Christmas Trees
717
Collatz
826
CSS Colors
261
Day of Week
900
Emirp Numbers
496
Emirp Numbers (Long)
522
Evil Numbers
640
Fizz Buzz
987
Leap Years
868
Niven Numbers
653
Pangram Grep
677
Prime Numbers
647
Tongue-twisters
511