12 Days of Christmas
80
99 Bottles of Beer
281
10
Abundant Numbers
275
Christmas Trees
95
Diamonds
49
Divisors
388
Emirp Numbers
365
Evil Numbers
491
Fibonacci
332
Fizz Buzz
271
363
Happy Numbers
396
Leap Years
372
Niven Numbers
327
Odious Numbers
490
Ordinal Numbers
Pascal’s Triangle
62
Pernicious Numbers
233
169
349
Prime Numbers
317314
Quine
958411478400804893862460942443453733944411179
Sierpiński Triangle
131
λ
226
123
201
15620610086
π
77
58
101
25745637
τ
80
59
99
27735638
φ
53
47
98
30715024
√2
50
49
100
26874728
𝑒
54
48
81
25614628