### 12 Days of Christmas

10^{th}

### 99 Bottles of Beer

12^{th}

### Abundant Numbers

### Arabic to Roman

9^{th}

### Brainfuck

9^{th}10

^{th}

### CSS Colors

### Christmas Trees

12^{th}

### Cubes

### Diamonds

11^{th}

### Divisors

18^{th}

### Emirp Numbers

4^{th}

### Evil Numbers

11^{th}

### Fibonacci

27^{th}

### Fizz Buzz

3^{rd}9

^{th}

### Happy Numbers

8^{th}

### Leap Years

26^{th}

### Leyland Numbers

### Lucky Tickets

### Morse Decoder

8^{th}

### Morse Encoder

10^{th}

### Niven Numbers

11^{th}

### Odious Numbers

11^{th}

### Ordinal Numbers

### Pangram Grep

9^{th}

### Pascal’s Triangle

8^{th}

### Pernicious Numbers

14^{th}

### Poker

### Prime Numbers

1^{st}

### Quine

1^{st}35

^{th}

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

### Roman to Arabic

10^{th}

### Rule 110

6^{th}

### Seven Segment

10^{th}

### Sierpiński Triangle

8^{th}

### Spelling Numbers

### Sudoku

### Ten-pin Bowling

### Tongue-twisters

### United States

### λ

7^{th}

### π

12^{th}

### τ

10^{th}

### φ

10^{th}

### √2

### 𝑒

8^{th}