99 Bottles of Beer
349
Abundant Numbers
671
Christmas Trees
355
Diamonds
333
Divisors
900
Emirp Numbers
374
Evil Numbers
741
Fibonacci
923
Fizz Buzz
596
Happy Numbers
453
Leap Years
597
Niven Numbers
537
Odious Numbers
769
Pascal’s Triangle
562
Pernicious Numbers
656
Prime Numbers
494
λ
102
π
57
τ
57
φ
51
√2
48
𝑒
47