Abundant Numbers
107th
Arithmetic Numbers
54th
Card Number Validation
63rd
Catalan Numbers
61st
Christmas Trees
90th
Collatz
139th
CSS Colors
83rd
Day of Week
74th
Emirp Numbers
139th
Emirp Numbers (Long)
60th
Evil Numbers
162nd
Fizz Buzz
1st
Leap Years
145th
Niven Numbers
234th
Pangram Grep
105th
Prime Numbers
196th
Tongue-twisters
151st