12 Days of Christmas
45th
Abundant Numbers
153rd
Abundant Numbers (Long)
125th
Arabic to Roman
17th
Arithmetic Numbers
114th
Ascending Primes
69th
Catalan Numbers
126th
Christmas Trees
202nd
Collatz
309th
Day of Week
144th
Divisors
385th
Evil Numbers
1st
Evil Numbers (Long)
35th
Farey Sequence
128th
Fibonacci
62nd179th
Fizz Buzz
86th671st
Foo Fizz Buzz Bar
276th
Fractions
46th
Happy Numbers
195th
Happy Numbers (Long)
105th
ISBN
61st
Leap Years
416th
Look and Say
75th
Lucky Numbers
82nd
Niven Numbers
295th
Niven Numbers (Long)
109th
Odious Numbers
148th
Odious Numbers (Long)
104th
Ordinal Numbers
4th
Pangram Grep
173rd
Pascal’s Triangle
74th
Pernicious Numbers
141st
Pernicious Numbers (Long)
87th
Prime Numbers
50th
Prime Numbers (Long)
189th
Quine
1st69th
Roman to Arabic
101st
Tongue-twisters
99th
Vampire Numbers
63rd