12 Days of Christmas
13th
Abundant Numbers
228th
Abundant Numbers (Long)
173rd
Arabic to Roman
73rd
Arithmetic Numbers
150th
Ascending Primes
107th
Catalan Numbers
144th
Christmas Trees
269th
Collatz
360th
Day of Week
184th
Divisors
436th
Evil Numbers
1st
Evil Numbers (Long)
43rd
Farey Sequence
150th
Fibonacci
67th197th
Fizz Buzz
90th139th
Foo Fizz Buzz Bar
106th
Fractions
44th
Happy Numbers
240th
Happy Numbers (Long)
144th
ISBN
121st
Leap Years
452nd
Look and Say
44th
Lucky Numbers
112th
Niven Numbers
329th
Niven Numbers (Long)
138th
Odious Numbers
163rd
Odious Numbers (Long)
117th
Ordinal Numbers
90th
Pangram Grep
220th
Pascal’s Triangle
47th
Pernicious Numbers
158th
Pernicious Numbers (Long)
110th
Prime Numbers
61st
Prime Numbers (Long)
238th
Quine
1st82nd
Roman to Arabic
135th
Tongue-twisters
172nd
Vampire Numbers
97th