12 Days of Christmas
138th
Collatz
59th
Divisors
135th
Evil Numbers
269th
Fibonacci
335th
Fizz Buzz
1st
Foo Fizz Buzz Bar
48th
Happy Numbers
66th
Happy Numbers (Long)
39th
Kolakoski Sequence
82nd
Leap Years
65th
Leyland Numbers
36th
Look and Say
27th
Niven Numbers
120th
Pascal’s Triangle
71st
Pernicious Numbers
124th
Prime Numbers
57th
Quine
30th
Recamán
66th
Tongue-twisters
75th