99 Bottles of Beer
19th
Abundant Numbers
28th
Christmas Trees
28th
Divisors
31st
Emirp Numbers
21st
Evil Numbers
42nd
Fibonacci
74th
Fizz Buzz
153rd
Leap Years
44th
Morse Decoder
10th
Morse Encoder
9th
Niven Numbers
28th
Odious Numbers
37th
Ordinal Numbers
25th
Pascal’s Triangle
21st
Prime Numbers
28th
Roman to Arabic
25th
Seven Segment
18th
π
35th