12 Days of Christmas
42nd
Collatz
66th
Divisors
141st
Evil Numbers
280th
Fibonacci
354th
Fizz Buzz
1st
Foo Fizz Buzz Bar
54th
Happy Numbers
75th
Happy Numbers (Long)
41st
Kolakoski Sequence
84th
Leap Years
74th
Leyland Numbers
41st
Look and Say
28th
Niven Numbers
131st
Pascal’s Triangle
75th
Pernicious Numbers
126th
Prime Numbers
59th
Quine
31st
Recamán
68th
Tongue-twisters
103rd