12 Days of Christmas
57th
Abundant Numbers
166th
Abundant Numbers (Long)
143rd
Arabic to Roman
17th
Arithmetic Numbers
123rd
Ascending Primes
88th
Catalan Numbers
141st
Christmas Trees
231st
Collatz
326th
Day of Week
166th
Divisors
404th
Evil Numbers
1st
Evil Numbers (Long)
41st
Farey Sequence
141st
Fibonacci
66th194th
Fizz Buzz
89th701st
Foo Fizz Buzz Bar
300th
Fractions
66th
Happy Numbers
211th
Happy Numbers (Long)
119th
ISBN
77th
Leap Years
439th
Look and Say
89th
Lucky Numbers
95th
Niven Numbers
319th
Niven Numbers (Long)
122nd
Odious Numbers
162nd
Odious Numbers (Long)
117th
Ordinal Numbers
5th
Pangram Grep
188th
Pascal’s Triangle
89th
Pernicious Numbers
156th
Pernicious Numbers (Long)
103rd
Prime Numbers
59th
Prime Numbers (Long)
208th
Quine
1st81st
Roman to Arabic
113th
Tongue-twisters
110th
Vampire Numbers
73rd