### 12 Days of Christmas

78^{th}

### 99 Bottles of Beer

9^{th}

### Abundant Numbers

### Arabic to Roman

15^{th}

### brainfuck

### Christmas Trees

15^{th}

### CSS Colors

### Cubes

### Diamonds

### Divisors

12^{th}

### Emirp Numbers

33^{rd}

### Emojify

### Evil Numbers

24^{th}

### Fibonacci

45^{th}

### Fizz Buzz

1^{st}

### Happy Numbers

29^{th}

### Intersection

### Leap Years

### Levenshtein Distance

### Leyland Numbers

### Lucky Tickets

### Morse Decoder

### Morse Encoder

12^{th}

### Niven Numbers

### Odious Numbers

19^{th}

### Ordinal Numbers

### Pangram Grep

### Pascal’s Triangle

5^{th}

### Pernicious Numbers

8^{th}

### Poker

### Prime Numbers

27^{th}

### Quine

54^{th}

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

### Roman to Arabic

11^{th}

### Rule 110

### Seven Segment

10^{th}

### Sierpiński Triangle

18^{th}

### Spelling Numbers

25^{th}

### Sudoku

### Ten-pin Bowling

### Tongue-twisters

### United States

### Vampire Numbers

### λ

### π

31^{st}

### τ

20^{th}

### φ

19^{th}

### √2

### 𝑒

20^{th}