99 Bottles of Beer
606
Abundant Numbers
688
Christmas Trees
401
Diamonds
391
Divisors
935
Emirp Numbers
453
Evil Numbers
727
Fibonacci
911
Fizz Buzz
647
Happy Numbers
573
Leap Years
589
Niven Numbers
528
Odious Numbers
753
Pascal’s Triangle
592
Pernicious Numbers
641
Prime Numbers
484
λ
159
π
63
τ
62
φ
51
√2
48
𝑒
46