12 Days of Christmas
13th
Abundant Numbers
220th
Abundant Numbers (Long)
166th
Arabic to Roman
72nd
Arithmetic Numbers
144th
Ascending Primes
101st
Catalan Numbers
136th
Christmas Trees
259th
Collatz
350th
Day of Week
176th
Divisors
427th
Evil Numbers
1st
Evil Numbers (Long)
41st
Farey Sequence
144th
Fibonacci
66th191st
Fizz Buzz
88th136th
Foo Fizz Buzz Bar
103rd
Fractions
43rd
Happy Numbers
234th
Happy Numbers (Long)
138th
ISBN
114th
Leap Years
442nd
Look and Say
44th
Lucky Numbers
108th
Niven Numbers
323rd
Niven Numbers (Long)
133rd
Odious Numbers
159th
Odious Numbers (Long)
113th
Ordinal Numbers
88th
Pangram Grep
213th
Pascal’s Triangle
47th
Pernicious Numbers
151st
Pernicious Numbers (Long)
105th
Prime Numbers
57th
Prime Numbers (Long)
233rd
Quine
1st75th
Roman to Arabic
132nd
Tongue-twisters
166th
Vampire Numbers
95th