12 Days of Christmas
173
99 Bottles of Beer
403
Abundant Numbers
226
Christmas Trees
89
Cubes
33
Diamonds
45
Divisors
27
Emirp Numbers
418
Evil Numbers
333
Fibonacci
643
Fizz Buzz
321
Happy Numbers
464
Leap Years
650
Niven Numbers
292
Pascal’s Triangle
53
Pernicious Numbers
210
Prime Numbers
368
Rule 110
4
Sierpiński Triangle
89
United States
106
λ
188
π
53
τ
53
φ
47
√2
49
𝑒
40