12 Days of Christmas
38th
24 Game
11th
99 Bottles of Beer
23rd
Arrows
20th
Card Number Validation
14th
Collatz
31st
Day of Week
25th
Diamonds
28th
Divisors
129th
Farey Sequence
18th
Fizz Buzz
255th
Forsyth–Edwards Notation
11th
ISBN
18th
Kaprekar Numbers
9th
Leap Years
72nd
Niven Numbers
58th
Pernicious Numbers
45th
Rock-paper-scissors-Spock-lizard
9th
Seven Segment
29th
Ten-pin Bowling
8th
Tongue-twisters
21st
π
14th
𝑒
18th