### 12 Days of Christmas

12^{th}

### 99 Bottles of Beer

### Abundant Numbers

### Arabic to Roman

### Brainfuck

### CSS Colors

### Christmas Trees

10^{th}

### Cubes

### Diamonds

12^{th}

### Divisors

11^{th}

### Emirp Numbers

12^{th}

### Evil Numbers

7^{th}

### Fibonacci

7^{th}

### Fizz Buzz

9^{th}

### Happy Numbers

10^{th}

### Leap Years

### Leyland Numbers

### Lucky Tickets

### Morse Decoder

### Morse Encoder

### Niven Numbers

11^{th}

### Odious Numbers

8^{th}

### Ordinal Numbers

### Pangram Grep

24^{th}

### Pascal’s Triangle

11^{th}

### Pernicious Numbers

6^{th}

### Poker

### Prime Numbers

1^{st}

### Quine

1^{st}

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

### Roman to Arabic

### Rule 110

### Seven Segment

### Sierpiński Triangle

### Spelling Numbers

### Sudoku

### Ten-pin Bowling

### Tongue-twisters

### United States

### λ

### π

8^{th}

### τ

8^{th}