12 Days of Christmas
38th99 Bottles of Beer
40thArabic to Roman
19thChristmas Trees
52ndDiamonds
31stDivisors
35thEmirp Numbers
31stEvil Numbers
58thFibonacci
99thFizz Buzz
59thHappy Numbers
55thLeap Years
25thNiven Numbers
35thOdious Numbers
54thPangram Grep
32ndPascalβs Triangle
3rdPernicious Numbers
80thPrime Numbers
77thSeven Segment
22nd