12 Days of Christmas
56th
Abundant Numbers
47th
Abundant Numbers (Long)
35th
Arithmetic Numbers
33rd
Christmas Trees
19th
Collatz
8th
Cubes
20th
Diamonds
27th
Fibonacci
218th1st
Fizz Buzz
118th
Foo Fizz Buzz Bar
18th
Fractions
28th
Happy Numbers
21st
Happy Numbers (Long)
15th
Hilbert Curve
6th
Leap Years
36th
ln 2
11th
Look and Say
28th
Lucky Numbers
16th
Mandelbrot
12th
Niven Numbers
53rd
Niven Numbers (Long)
29th
Pascal’s Triangle
33rd
Quine
108th
Tongue-twisters
24th
Tower of Hanoi
42nd
Trinomial Triangle
8th
γ
10th
λ
17th
π
21st
τ
15th
φ
18th
√2
15th
𝑒
18th