Abundant Numbers
105th
Arithmetic Numbers
53rd
Card Number Validation
63rd
Catalan Numbers
60th
Christmas Trees
92nd
Collatz
135th
CSS Colors
97th
Day of Week
74th
Emirp Numbers
142nd
Emirp Numbers (Long)
60th
Evil Numbers
158th
Fizz Buzz
1st
Leap Years
144th
Niven Numbers
229th
Pangram Grep
104th
Prime Numbers
193rd
Tongue-twisters
153rd