12 Days of Christmas
811th
99 Bottles of Beer
673rd
Abundant Numbers
769th
Arrows
243rd
Collatz
546th
Emirp Numbers
646th49th
Evil Numbers (Long)
474th
Fizz Buzz
1,619th313th
Foo Fizz Buzz Bar
534th
Leap Years
233rd84th287th71st501st
Niven Numbers (Long)
219th
Prime Numbers
752nd
Rock-paper-scissors-Spock-lizard
258th
Sierpiński Triangle
365th