12 Days of Christmas
15th
Abundant Numbers
233rd
Abundant Numbers (Long)
179th
Arabic to Roman
78th
Arithmetic Numbers
159th
Ascending Primes
111th
Catalan Numbers
156th
Christmas Trees
277th
Collatz
377th
Day of Week
194th
Divisors
451st
Evil Numbers
1st
Evil Numbers (Long)
48th
Farey Sequence
164th
Fibonacci
68th213th
Fizz Buzz
90th148th
Foo Fizz Buzz Bar
114th
Fractions
46th
Happy Numbers
245th
Happy Numbers (Long)
151st
ISBN
126th
Leap Years
466th
Look and Say
45th
Lucky Numbers
118th
Niven Numbers
339th
Niven Numbers (Long)
144th
Odious Numbers
176th
Odious Numbers (Long)
126th
Ordinal Numbers
91st
Pangram Grep
225th
Pascal’s Triangle
49th
Pernicious Numbers
163rd
Pernicious Numbers (Long)
120th
Prime Numbers
71st
Prime Numbers (Long)
250th
Quine
1st92nd
Roman to Arabic
138th
Tongue-twisters
177th
Vampire Numbers
105th