12 Days of Christmas
168
99 Bottles of Beer
387
Abundant Numbers
219
Christmas Trees
86
Cubes
31
Diamonds
44
Divisors
27
Emirp Numbers
395
Evil Numbers
320
Fibonacci
622
Fizz Buzz
319
Happy Numbers
442
Leap Years
641
Niven Numbers
286
Odious Numbers
Pascal’s Triangle
48
Pernicious Numbers
204
Prime Numbers
352
Rule 110
4
Sierpiński Triangle
86
United States
103
λ
177
π
50
τ
50
φ
44
√2
46
𝑒
38