Abundant Numbers
814
Arithmetic Numbers
824
Card Number Validation
607
Catalan Numbers
695
Christmas Trees
745
Collatz
873
CSS Colors
129
Day of Week
947
Emirp Numbers
453
Emirp Numbers (Long)
555
Evil Numbers
661
Fizz Buzz
1,000
Leap Years
911
Niven Numbers
677
Pangram Grep
711
Prime Numbers
667
Tongue-twisters
348