Abundant Numbers
793
Arithmetic Numbers
790
Card Number Validation
569
Catalan Numbers
663
Christmas Trees
723
Collatz
848
CSS Colors
260
Day of Week
894
Emirp Numbers
498
Emirp Numbers (Long)
525
Evil Numbers
642
Fizz Buzz
992
Leap Years
893
Niven Numbers
661
Pangram Grep
684
Prime Numbers
647
Tongue-twisters
516