12 Days of Christmas
63rd
Abundant Numbers
173rd
Abundant Numbers (Long)
148th
Arabic to Roman
18th
Arithmetic Numbers
134th
Ascending Primes
97th
Catalan Numbers
150th
Christmas Trees
240th
Collatz
341st
Day of Week
173rd
Divisors
416th
Evil Numbers
1st
Evil Numbers (Long)
44th
Farey Sequence
154th
Fibonacci
67th206th
Fizz Buzz
90th722nd
Foo Fizz Buzz Bar
315th
Fractions
72nd
Happy Numbers
216th
Happy Numbers (Long)
127th
ISBN
82nd
Leap Years
454th
Look and Say
96th
Lucky Numbers
103rd
Niven Numbers
325th
Niven Numbers (Long)
130th
Odious Numbers
173rd
Odious Numbers (Long)
123rd
Ordinal Numbers
7th
Pangram Grep
195th
Pascal’s Triangle
91st
Pernicious Numbers
162nd
Pernicious Numbers (Long)
111th
Prime Numbers
69th
Prime Numbers (Long)
215th
Quine
1st86th
Roman to Arabic
118th
Tongue-twisters
114th
Vampire Numbers
79th