12 Days of Christmas
39th
Collatz
55th
Divisors
128th
Evil Numbers
248th
Fibonacci
318th
Fizz Buzz
1st
Foo Fizz Buzz Bar
47th
Happy Numbers
70th
Happy Numbers (Long)
38th
Kolakoski Sequence
75th
Leap Years
61st
Leyland Numbers
37th
Look and Say
24th
Niven Numbers
107th
Pascal’s Triangle
65th
Pernicious Numbers
114th
Prime Numbers
53rd
Quine
28th
Recamán
61st
Tongue-twisters
83rd