12 Days of Christmas
7th
99 Bottles of Beer
12th
Abundant Numbers
13th
Arabic to Roman
5th
Christmas Trees
8th
CSS Colors
5th
Cubes
7th
Diamonds
6th
Divisors
211th
10th
Emirp Numbers
8th
Evil Numbers
171st
8th
Fibonacci
40th
Fizz Buzz
509th347th37th
Happy Numbers
8th
Leap Years
167th
21st
Leyland Numbers
12th
Morse Decoder
6th
Morse Encoder
7th
Niven Numbers
20th
Odious Numbers
135th
9th
Ordinal Numbers
35th
Pangram Grep
13th
Pascal’s Triangle
11th
Pernicious Numbers
13th
Prime Numbers
183rd
5th
Quine
50th
Rock-paper-scissors-Spock-lizard
6th
Roman to Arabic
7th
Rule 110
9th
Seven Segment
7th
Sierpiński Triangle
9th
Tongue-twisters
11th
United States
8th
Vampire Numbers
6th
λ
9th
π
12th
τ
7th
φ
7th
√2
7th
𝑒
7th