12 Days of Christmas
156
148171
152
99 Bottles of Beer
17
15
Abundant Numbers
177
Christmas Trees
78
Divisors
530
Emirp Numbers
270
Evil Numbers
303
Fibonacci
132
Fizz Buzz
223285177269
228237
Happy Numbers
327
Leap Years
303
36
Odious Numbers
290
Pascal’s Triangle
32
Pernicious Numbers
216
Prime Numbers
265
Quine
890
Rock-paper-scissors-Spock-lizard
260
Sierpiński Triangle
77
Smith Numbers
37
45
United States
86
Vampire Numbers
69
λ
147
π
208
44
τ
26
44
φ
94
26
√2
30
𝑒
30