99 Bottles of Beer
18th
Arabic to Roman
Christmas Trees
9th
Cubes
3rd
Diamonds
5th
Divisors
1st53rd
Emirp Numbers
18th
Evil Numbers
38th
Fibonacci
75th
Fizz Buzz
29th
Happy Numbers
Leap Years
17th
Leyland Numbers
18th
Niven Numbers
32nd
Odious Numbers
36th
Ordinal Numbers
17th
Pangram Grep
18th
Pascalβs Triangle
21st
Pernicious Numbers
30th
Prime Numbers
41st
Quine
62nd