12 Days of Christmas
52nd
Abundant Numbers
42nd
Abundant Numbers (Long)
30th
Arithmetic Numbers
25th
Collatz
43rd
Cubes
17th
Diamonds
26th
Fibonacci
199th1st
Fizz Buzz
117th
Foo Fizz Buzz Bar
16th
Happy Numbers
19th
Happy Numbers (Long)
14th
Leap Years
73rd
ln 2
11th
Look and Say
25th
Lucky Numbers
14th
Niven Numbers
47th
Niven Numbers (Long)
26th
Pascalβs Triangle
36th
Quine
99th
Tongue-twisters
21st
Ξ³
9th
Ξ»
15th
Ο
18th
Ο
14th
Ο
17th
β2
14th
π
20th