Abundant Numbers
110th
Arithmetic Numbers
55th
Card Number Validation
65th
Catalan Numbers
64th
Christmas Trees
91st
Collatz
144th
CSS Colors
85th
Day of Week
75th
Emirp Numbers
139th
Emirp Numbers (Long)
60th
Evil Numbers
163rd
Fizz Buzz
1st
Leap Years
148th
Niven Numbers
235th
Pangram Grep
107th
Prime Numbers
198th
Tongue-twisters
156th