Abundant Numbers
110th
Arithmetic Numbers
55th
Card Number Validation
66th
Catalan Numbers
64th
Christmas Trees
97th
Collatz
144th
CSS Colors
100th
Day of Week
75th
Emirp Numbers
145th
Emirp Numbers (Long)
62nd
Evil Numbers
163rd
Fizz Buzz
1st
Leap Years
148th
Niven Numbers
235th
Pangram Grep
107th
Prime Numbers
198th
Tongue-twisters
158th