12 Days of Christmas
143
61104
61
99 Bottles of Beer
16
8
Abundant Numbers
163
Christmas Trees
68
Divisors
502
Emirp Numbers
257
Evil Numbers
267
Fibonacci
112
Fizz Buzz
223285156269
217213
Happy Numbers
270
Leap Years
302
30
Odious Numbers
255
Pascal’s Triangle
27
Pernicious Numbers
190
Prime Numbers
240
Quine
890
Rock-paper-scissors-Spock-lizard
187
Sierpiński Triangle
85
Smith Numbers
34
31
United States
65
Vampire Numbers
55
λ
79
π
208
40
τ
26
39
φ
94
24
√2
27
𝑒
27