12 Days of Christmas
11th
Abundant Numbers
211th
Abundant Numbers (Long)
153rd
Arabic to Roman
71st
Arithmetic Numbers
138th
Ascending Primes
88th
Catalan Numbers
129th
Christmas Trees
245th
Collatz
339th
Day of Week
161st
Divisors
419th
Evil Numbers
1st
Evil Numbers (Long)
35th
Farey Sequence
137th
Fibonacci
63rd183rd
Fizz Buzz
88th132nd
Foo Fizz Buzz Bar
96th
Fractions
37th
Happy Numbers
225th
Happy Numbers (Long)
127th
ISBN
105th
Leap Years
426th
Look and Say
39th
Lucky Numbers
100th
Niven Numbers
309th
Niven Numbers (Long)
125th
Odious Numbers
149th
Odious Numbers (Long)
105th
Ordinal Numbers
87th
Pangram Grep
202nd
Pascal’s Triangle
43rd
Pernicious Numbers
141st
Pernicious Numbers (Long)
94th
Prime Numbers
52nd
Prime Numbers (Long)
221st
Quine
1st72nd
Roman to Arabic
126th
Tongue-twisters
157th
Vampire Numbers
89th