12 Days of Christmas
401
99 Bottles of Beer
387
Abundant Numbers
721
Christmas Trees
659
Collatz
770
Divisors
947
Emirp Numbers
487
Evil Numbers
870
Fibonacci
947
Fizz Buzz
930
Foo Fizz Buzz Bar
759
Happy Numbers
545
Leap Years
796
Niven Numbers
917
Odious Numbers
870
Pernicious Numbers
727
Prime Numbers
635
Quine
969
π
87
𝑒
72