12 Days of Christmas
47th
Abundant Numbers
154th
Abundant Numbers (Long)
127th
Arabic to Roman
17th
Arithmetic Numbers
116th
Ascending Primes
70th
Catalan Numbers
129th
Christmas Trees
208th
Collatz
312th
Day of Week
146th
Divisors
389th
Evil Numbers
1st
Evil Numbers (Long)
35th
Farey Sequence
129th
Fibonacci
63rd183rd
Fizz Buzz
88th677th
Foo Fizz Buzz Bar
280th
Fractions
49th
Happy Numbers
197th
Happy Numbers (Long)
106th
ISBN
62nd
Leap Years
418th
Look and Say
75th
Lucky Numbers
83rd
Niven Numbers
299th
Niven Numbers (Long)
111th
Odious Numbers
149th
Odious Numbers (Long)
105th
Ordinal Numbers
4th
Pangram Grep
175th
Pascal’s Triangle
75th
Pernicious Numbers
141st
Pernicious Numbers (Long)
88th
Prime Numbers
52nd
Prime Numbers (Long)
193rd
Quine
1st72nd
Roman to Arabic
104th
Tongue-twisters
100th
Vampire Numbers
63rd