12 Days of Christmas
56th
99 Bottles of Beer
Divisors
53rd
Emirp Numbers
38th
Fibonacci
82nd
Fizz Buzz
Foo Fizz Buzz Bar
Leap Years
Niven Numbers
49th
Ordinal Numbers
Pernicious Numbers
40th
Prime Numbers
58th
Rock-paper-scissors-Spock-lizard
194th
SierpiΕski Triangle
26th
Ξ»
18th
π
20th