12 Days of Christmas
54th
Abundant Numbers
46th
Abundant Numbers (Long)
34th
Arithmetic Numbers
32nd
Christmas Trees
17th
Collatz
Cubes
20th
Diamonds
24th
Fibonacci
210th1st
Fizz Buzz
118th
Foo Fizz Buzz Bar
16th
Fractions
27th
Happy Numbers
18th
Happy Numbers (Long)
14th
Hilbert Curve
5th
Leap Years
33rd
ln 2
9th
Look and Say
28th
Lucky Numbers
15th
Mandelbrot
12th
Niven Numbers
50th
Niven Numbers (Long)
27th
Pascal’s Triangle
31st
Quine
105th
Tongue-twisters
23rd
Trinomial Triangle
7th
γ
7th
λ
16th
π
18th
τ
13th
φ
15th
√2
12th
𝑒
16th