12 Days of Christmas
142nd
Collatz
65th
Divisors
140th
Evil Numbers
278th
Fibonacci
345th
Fizz Buzz
1st
Foo Fizz Buzz Bar
48th
Happy Numbers
67th
Happy Numbers (Long)
40th
Kolakoski Sequence
82nd
Leap Years
70th
Leyland Numbers
37th
Look and Say
27th
Niven Numbers
126th
Pascal’s Triangle
74th
Pernicious Numbers
124th
Prime Numbers
59th
Quine
30th
Recamán
67th
Tongue-twisters
84th