12 Days of Christmas
53rd
Abundant Numbers
163rd
Abundant Numbers (Long)
139th
Arabic to Roman
17th
Arithmetic Numbers
121st
Ascending Primes
85th
Catalan Numbers
136th
Christmas Trees
224th
Collatz
321st
Day of Week
161st
Divisors
397th
Evil Numbers
1st
Evil Numbers (Long)
41st
Farey Sequence
137th
Fibonacci
66th191st
Fizz Buzz
88th696th
Foo Fizz Buzz Bar
295th
Fractions
61st
Happy Numbers
207th
Happy Numbers (Long)
117th
ISBN
72nd
Leap Years
434th
Look and Say
84th
Lucky Numbers
92nd
Niven Numbers
313th
Niven Numbers (Long)
120th
Odious Numbers
159th
Odious Numbers (Long)
113th
Ordinal Numbers
5th
Pangram Grep
185th
Pascal’s Triangle
85th
Pernicious Numbers
151st
Pernicious Numbers (Long)
100th
Prime Numbers
57th
Prime Numbers (Long)
204th
Quine
1st75th
Roman to Arabic
111th
Tongue-twisters
107th
Vampire Numbers
71st