99 Bottles of Beer
606
Abundant Numbers
688
Christmas Trees
402
Diamonds
391
Divisors
935
Emirp Numbers
447
Evil Numbers
728
Fibonacci
911
Fizz Buzz
648
Happy Numbers
573
Leap Years
589
Niven Numbers
528
Odious Numbers
754
Pascal’s Triangle
592
Pernicious Numbers
642
Prime Numbers
485
λ
147
π
63
τ
63
φ
51
√2
48
𝑒
46