### 12 Days of Christmas

7^{th}

### 99 Bottles of Beer

2^{nd}

### Abundant Numbers

8^{th}

### Arabic to Roman

### brainfuck

4^{th}

### Christmas Trees

8^{th}

### CSS Colors

2^{nd}

### Cubes

2^{nd}

### Diamonds

6^{th}

### Divisors

14^{th}

### Emirp Numbers

8^{th}

### Emojify

2^{nd}

### Evil Numbers

5^{th}

### Fibonacci

1^{st}

### Fizz Buzz

9^{th}

### Happy Numbers

### Intersection

### Kolakoski Constant

3^{rd}

### Kolakoski Sequence

### Leap Years

15^{th}

### Levenshtein Distance

14^{th}

### Leyland Numbers

4^{th}

### Look and Say

### Lucky Tickets

4^{th}

### Morse Decoder

### Morse Encoder

3^{rd}

### Niven Numbers

5^{th}

### Odious Numbers

5^{th}

### Ordinal Numbers

5^{th}

### Pangram Grep

### Pascal’s Triangle

7^{th}

### Pernicious Numbers

### Poker

### Prime Numbers

4^{th}

### Quine

1^{st}8

^{th}11

^{th}

### Recamán

6^{th}

### Rock-paper-scissors-Spock-lizard

4^{th}

### Roman to Arabic

4^{th}

### Rule 110

### Seven Segment

### Sierpiński Triangle

6^{th}

### Spelling Numbers

### Sudoku

### Ten-pin Bowling

### Tongue-twisters

7^{th}

### United States

10^{th}

### Vampire Numbers

3^{rd}

### λ

6^{th}

### π

6^{th}

### τ

5^{th}

### φ

5^{th}

### √2

4^{th}

### 𝑒

5^{th}