Abundant Numbers
50th
Arabic to Roman
24th
Christmas Trees
34th
CSS Colors
27th
Cubes
19th
Diamonds
42nd
Divisors
58th
Emirp Numbers
46th
Fizz Buzz
133rd
Leap Years
60th
Look and Say
10th
Morse Decoder
19th
Niven Numbers
72nd
Prime Numbers
66th
Quine
1st
Rule 110
17th
Seven Segment
24th
United States
24th