12 Days of Christmas
39th
Collatz
56th
Divisors
129th
Evil Numbers
250th
Fibonacci
319th
Fizz Buzz
1st
Foo Fizz Buzz Bar
48th
Happy Numbers
70th
Happy Numbers (Long)
38th
Kolakoski Sequence
76th
Leap Years
61st
Leyland Numbers
37th
Look and Say
26th
Niven Numbers
107th
Pascal’s Triangle
65th
Pernicious Numbers
115th
Prime Numbers
53rd
Quine
28th
Recamán
63rd
Tongue-twisters
84th