99 Bottles of Beer
25th
Abundant Numbers
34th
Arabic to Roman
19th
Christmas Trees
23rd11th
27th
20th
5th
Divisors
250th
255th
50th
Evil Numbers
107th
84th
36th
Fibonacci
327th
369th140th46th
Fizz Buzz
85th348th
764th197th147th
Happy Numbers
105th
46th
Leap Years
126th
57th103rd45th30th104th
31st
Niven Numbers
38th
Ordinal Numbers
29th
Pascal’s Triangle
38th
Pernicious Numbers
88th
65th
34th
Prime Numbers
209th
61st
130th
Prime Numbers (Long)
1st
Quine
110th
Rock-paper-scissors-Spock-lizard
10th
Roman to Arabic
23rd
United States
16th
Van Eck Sequence
10th