12 Days of Christmas
80
99 Bottles of Beer
246
Abundant Numbers
226
Christmas Trees
89
Cubes
36
Diamonds
45
Divisors
27
Emirp Numbers
255
Evil Numbers
333
Fibonacci
643
Fizz Buzz
321
Happy Numbers
304
Leap Years
650
Niven Numbers
292
Odious Numbers
Pascal’s Triangle
52
Pernicious Numbers
210
Prime Numbers
368
Rule 110
7
Sierpiński Triangle
121
United States
106
λ
112
π
53
τ
53
φ
47
√2
49
𝑒
40