12 Days of Christmas
45th
Abundant Numbers
151st
Abundant Numbers (Long)
124th
Arabic to Roman
17th
Arithmetic Numbers
114th
Ascending Primes
64th
Catalan Numbers
123rd
Christmas Trees
201st
Collatz
307th
Day of Week
137th
Divisors
381st
Evil Numbers
1st
Evil Numbers (Long)
35th
Farey Sequence
127th
Fibonacci
63rd176th
Fizz Buzz
86th670th
Foo Fizz Buzz Bar
274th
Fractions
46th
Happy Numbers
193rd
Happy Numbers (Long)
105th
ISBN
60th
Leap Years
414th
Look and Say
72nd
Lucky Numbers
80th
Niven Numbers
293rd
Niven Numbers (Long)
107th
Odious Numbers
147th
Odious Numbers (Long)
102nd
Ordinal Numbers
4th
Pangram Grep
171st
Pascal’s Triangle
74th
Pernicious Numbers
140th
Pernicious Numbers (Long)
85th
Prime Numbers
50th
Prime Numbers (Long)
186th
Quine
1st67th
Roman to Arabic
99th
Tongue-twisters
98th
Vampire Numbers
61st