Abundant Numbers
127th
Arithmetic Numbers
72nd
Card Number Validation
81st
Catalan Numbers
80th
Christmas Trees
98th
Collatz
169th
CSS Colors
93rd
Day of Week
102nd
Emirp Numbers
148th
Emirp Numbers (Long)
68th
Evil Numbers
178th
Fizz Buzz
1st
Leap Years
181st
Niven Numbers
257th
Pangram Grep
118th
Prime Numbers
216th
Tongue-twisters
170th