### 12 Days of Christmas

5^{th}

### 99 Bottles of Beer

17^{th}

### Abundant Numbers

### Arabic to Roman

8^{th}

### Brainfuck

30^{th}7

^{th}

### CSS Colors

### Christmas Trees

6^{th}

### Cubes

### Diamonds

### Divisors

12^{th}

### Emirp Numbers

8^{th}

### Evil Numbers

11^{th}

### Fibonacci

7^{th}

### Fizz Buzz

9^{th}

### Happy Numbers

9^{th}

### Leap Years

### Leyland Numbers

### Lucky Tickets

### Morse Decoder

6^{th}

### Morse Encoder

7^{th}

### Niven Numbers

### Odious Numbers

11^{th}

### Ordinal Numbers

### Pangram Grep

10^{th}

### Pascal’s Triangle

9^{th}

### Pernicious Numbers

10^{th}

### Poker

### Prime Numbers

1^{st}

### Quine

91^{st}16

^{th}

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

### Roman to Arabic

### Rule 110

### Seven Segment

6^{th}

### Sierpiński Triangle

5^{th}

### Spelling Numbers

9^{th}

### Sudoku

### Ten-pin Bowling

### United States

### λ

### π

### τ

### φ

9^{th}