12 Days of Christmas
8299 Bottles of Beer
251Abundant Numbers
226Christmas Trees
89Cubes
38Diamonds
45Divisors
27Emirp Numbers
255Evil Numbers
333Fibonacci
643Fizz Buzz
321Happy Numbers
304Leap Years
650Niven Numbers
292Pascal’s Triangle
53Pernicious Numbers
210Prime Numbers
368Rule 110
7Sierpiński Triangle
121United States
106λ
119π
53τ
53φ
47√2
49𝑒
40