12 Days of Christmas
158
150
174
154
99 Bottles of Beer
17
16
Abundant Numbers
191
Christmas Trees
83
Divisors
569
Emirp Numbers
284
Evil Numbers
320
Fibonacci
137
Fizz Buzz
327
289
181
276
234
243Happy Numbers
348
Leap Years
315
37
Odious Numbers
308
Pascal’s Triangle
34
Pernicious Numbers
229
Prime Numbers
276
Quine
912
Rock-paper-scissors-Spock-lizard
277
Sierpiński Triangle
82
Smith Numbers
40
49
United States
91
Vampire Numbers
76
λ
180
π
259
47
τ
27
47
φ
105
27
√2
32
𝑒
32