12 Days of Christmas
80
99 Bottles of Beer
284
10
Abundant Numbers
275
Christmas Trees
95
Diamonds
49
Divisors
388
Emirp Numbers
365
Evil Numbers
491
Fibonacci
332
Fizz Buzz
270
363
Happy Numbers
396
Leap Years
371
Niven Numbers
327
Odious Numbers
489
Ordinal Numbers
Pascal’s Triangle
62
Pernicious Numbers
233
169
349
Prime Numbers
316314
Quine
967411479403808602866463944445457737946417857
Sierpiński Triangle
131
λ
226
124
200
1552059986
π
77
58
102
25745637
τ
80
59
101
27735638
φ
52
47
99
30715024
√2
50
49
102
26874728
𝑒
54
47
82
25614628