### 12 Days of Christmas

### 99 Bottles of Beer

### Abundant Numbers

### Arabic to Roman

### Brainfuck

### CSS Colors

### Christmas Trees

### Cubes

### Diamonds

### Divisors

28^{th}

### Emirp Numbers

7^{th}30

^{th}

### Evil Numbers

19^{th}1

^{st}38

^{th}6

^{th}

### Fibonacci

1^{st}32

^{nd}

### Fizz Buzz

1^{st}

### Happy Numbers

6^{th}10

^{th}

### Intersection

### Leap Years

### Leyland Numbers

### Lucky Tickets

### Morse Decoder

### Morse Encoder

### Niven Numbers

40^{th}

### Odious Numbers

13^{th}8

^{th}1

^{st}6

^{th}

### Ordinal Numbers

### Pangram Grep

31^{st}

### Pascal’s Triangle

16^{th}

### Pernicious Numbers

23^{rd}5

^{th}

### Poker

### Prime Numbers

11^{th}49

^{th}36

^{th}30

^{th}

### Quine

45^{th}19

^{th}

### 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

31^{st}

### τ

21^{st}