12 Days of Christmas
518th52nd
99 Bottles of Beer
44th
Arabic to Roman
50th
Arrows
33rd
CSS Colors
34th
Day of Week
1st
Fizz Buzz
147th666th1st
Happy Numbers (Long)
318th51st
Look and Say
47th
Lucky Tickets
133rd25th
Number Spiral
172nd27th
Pascal’s Triangle
410th67th
Pernicious Numbers
81st
Recamán
42nd