12 Days of Christmas
15th
Abundant Numbers
232nd
Abundant Numbers (Long)
178th
Arabic to Roman
77th
Arithmetic Numbers
160th
Ascending Primes
113th
Catalan Numbers
150th
Christmas Trees
275th
Collatz
369th
Day of Week
189th
Divisors
447th
Evil Numbers
1st
Evil Numbers (Long)
44th
Farey Sequence
160th
Fibonacci
67th206th
Fizz Buzz
90th146th
Foo Fizz Buzz Bar
114th
Fractions
45th
Happy Numbers
243rd
Happy Numbers (Long)
149th
ISBN
125th
Leap Years
462nd
Look and Say
45th
Lucky Numbers
117th
Niven Numbers
336th
Niven Numbers (Long)
144th
Odious Numbers
173rd
Odious Numbers (Long)
123rd
Ordinal Numbers
91st
Pangram Grep
224th
Pascal’s Triangle
48th
Pernicious Numbers
162nd
Pernicious Numbers (Long)
116th
Prime Numbers
69th
Prime Numbers (Long)
246th
Quine
1st86th
Roman to Arabic
138th
Tongue-twisters
174th
Vampire Numbers
105th