12 Days of Christmas
368
99 Bottles of Beer
328
Abundant Numbers
605
Catalan Numbers
863
Christmas Trees
628
Collatz
655
Divisors
806
Emirp Numbers
444
Evil Numbers
667
Fibonacci
716
1,000
947
Fizz Buzz
312
606
788
697
Leap Years
654
588
815
796
Niven Numbers
571
Odious Numbers
690
Ordinal Numbers
413
Pascal’s Triangle
515
Pernicious Numbers
588
Prime Numbers
784
Sierpiński Triangle
462
φ
619
√2
721
𝑒
716