Abundant Numbers
102nd
Arithmetic Numbers
49th
Card Number Validation
51st
Catalan Numbers
56th
Christmas Trees
88th
Collatz
122nd
CSS Colors
76th
Day of Week
69th
Emirp Numbers
131st
Emirp Numbers (Long)
53rd
Evil Numbers
152nd
Fizz Buzz
1st
Leap Years
138th
Niven Numbers
216th
Pangram Grep
99th
Prime Numbers
183rd
Tongue-twisters
144th