99 Bottles of Beer
346
Abundant Numbers
660
Christmas Trees
349
Diamonds
327
Divisors
886
Emirp Numbers
368
Evil Numbers
727
Fibonacci
911
Fizz Buzz
591
Happy Numbers
444
Leap Years
588
Niven Numbers
526
Odious Numbers
753
Pascal’s Triangle
548
Pernicious Numbers
641
Prime Numbers
484
λ
100
π
56
τ
56
φ
50
√2
47
𝑒
46