12 Days of Christmas
156
148171
152
99 Bottles of Beer
17
15
Abundant Numbers
184
Christmas Trees
81
Divisors
547
Emirp Numbers
275
Evil Numbers
307
Fibonacci
134
Fizz Buzz
224286180272
232240
Happy Numbers
336
Leap Years
308
36
Odious Numbers
295
Pascal’s Triangle
32
Pernicious Numbers
221
Prime Numbers
267
Quine
891
Rock-paper-scissors-Spock-lizard
269
Sierpiński Triangle
80
Smith Numbers
37
45
United States
88
Vampire Numbers
72
λ
172
π
209
45
τ
27
45
φ
95
26
√2
31
𝑒
31