12 Days of Christmas
13th
Abundant Numbers
223rd
Abundant Numbers (Long)
170th
Arabic to Roman
73rd
Arithmetic Numbers
147th
Ascending Primes
104th
Catalan Numbers
141st
Christmas Trees
266th
Collatz
355th
Day of Week
181st
Divisors
435th
Evil Numbers
1st
Evil Numbers (Long)
41st
Farey Sequence
148th
Fibonacci
66th194th
Fizz Buzz
89th137th
Foo Fizz Buzz Bar
104th
Fractions
44th
Happy Numbers
239th
Happy Numbers (Long)
141st
ISBN
119th
Leap Years
447th
Look and Say
45th
Lucky Numbers
111th
Niven Numbers
329th
Niven Numbers (Long)
136th
Odious Numbers
162nd
Odious Numbers (Long)
117th
Ordinal Numbers
89th
Pangram Grep
216th
Pascal’s Triangle
47th
Pernicious Numbers
156th
Pernicious Numbers (Long)
108th
Prime Numbers
59th
Prime Numbers (Long)
238th
Quine
1st81st
Roman to Arabic
134th
Tongue-twisters
170th
Vampire Numbers
97th