12 Days of Christmas
115th
99 Bottles of Beer
111th
Abundant Numbers
39th
Arabic to Roman
10th
brainfuck
17th
Christmas Trees
47th
CSS Colors
50th
Diamonds
16th
Divisors
34th
Emirp Numbers
45th
Evil Numbers
49th
Fibonacci
87th
Fizz Buzz
62nd
Happy Numbers
25th
Leap Years
33rd
Leyland Numbers
25th
Morse Decoder
19th
Morse Encoder
18th
Niven Numbers
34th
Odious Numbers
42nd
Ordinal Numbers
Pangram Grep
19th
Pascal’s Triangle
36th
Pernicious Numbers
38th
Prime Numbers
25th
Quine
12th
Rock-paper-scissors-Spock-lizard
Roman to Arabic
20th
Rule 110
22nd
Seven Segment
21st
Sierpiński Triangle
20th
Spelling Numbers
8th
Sudoku
United States
λ
13th
π
13th
τ
11th
φ
17th
√2
17th
𝑒
20th