12 Days of Christmas
90th
99 Bottles of Beer
28th
Abundant Numbers
72nd
ASCII Table
17th
Christmas Trees
41st
Cubes
19th
Day of Week
1st
Diamonds
35th
Fizz Buzz
225th
ISBN
19th
Number Spiral
9th
Pangram Grep
21st
Roman to Arabic
27th
Rule 110
17th
Sierpiński Triangle
39th
Star Wars Opening Crawl
10th