12 Days of Christmas
800
99 Bottles of Beer
572
Abundant Numbers
630
Catalan Numbers
863
Christmas Trees
721
Collatz
782
Divisors
851
Emirp Numbers
548
Evil Numbers
667
Fibonacci
716
1,000
947
Fizz Buzz
312
606
788
763
Leap Years
673
588
815
796
Niven Numbers
571
Odious Numbers
690
Ordinal Numbers
506
Pascal’s Triangle
557
Pernicious Numbers
588
Prime Numbers
784
Sierpiński Triangle
496
φ
631
√2
721
𝑒
716