12 Days of Christmas
56th
99 Bottles of Beer
Divisors
51st
Emirp Numbers
37th
Fibonacci
82nd
Fizz Buzz
Foo Fizz Buzz Bar
Leap Years
Niven Numbers
48th
Ordinal Numbers
Pernicious Numbers
40th
Prime Numbers
58th
Rock-paper-scissors-Spock-lizard
193rd
SierpiΕski Triangle
26th
Ξ»
17th
π
20th