Abundant Numbers
105th
Arithmetic Numbers
53rd
Card Number Validation
61st
Catalan Numbers
60th
Christmas Trees
92nd
Collatz
132nd
CSS Colors
95th
Day of Week
74th
Emirp Numbers
139th
Emirp Numbers (Long)
57th
Evil Numbers
156th
Fizz Buzz
1st
Leap Years
142nd
Niven Numbers
227th
Pangram Grep
103rd
Prime Numbers
191st
Tongue-twisters
153rd