Abundant Numbers
123rd
Arithmetic Numbers
71st
Card Number Validation
78th
Catalan Numbers
76th
Christmas Trees
97th
Collatz
168th
CSS Colors
91st
Day of Week
100th
Emirp Numbers
146th
Emirp Numbers (Long)
67th
Evil Numbers
177th
Fizz Buzz
1st
Leap Years
179th
Niven Numbers
253rd
Pangram Grep
117th
Prime Numbers
213th
Tongue-twisters
168th