12 Days of Christmas
366
99 Bottles of Beer
325
Abundant Numbers
594
Catalan Numbers
839
Christmas Trees
617
Collatz
641
Divisors
793
Emirp Numbers
435
Evil Numbers
654
Fibonacci
672
958
934
Fizz Buzz
298
578
765
692
Leap Years
628
543
779
784
Niven Numbers
560
Odious Numbers
675
Ordinal Numbers
401
Pascal’s Triangle
503
Pernicious Numbers
575
Prime Numbers
769
Sierpiński Triangle
452
φ
601
√2
704
𝑒
698