### 12 Days of Christmas

8^{th}

### 99 Bottles of Beer

6^{th}8

^{th}

### Abundant Numbers

### Arabic to Roman

7^{th}7

^{th}

### Brainfuck

### CSS Colors

### Christmas Trees

7^{th}12

^{th}8

^{th}

### Cubes

### Diamonds

### Divisors

12^{th}22

^{nd}9

^{th}

### Emirp Numbers

4^{th}8

^{th}8

^{th}

### Evil Numbers

17^{th}13

^{th}11

^{th}

### Fibonacci

260^{th}11

^{th}14

^{th}37

^{th}

### Fizz Buzz

3^{rd}49

^{th}104

^{th}19

^{th}

### Happy Numbers

8^{th}5

^{th}13

^{th}

### Leap Years

### Leyland Numbers

### Lucky Tickets

### Morse Decoder

7^{th}6

^{th}

### Morse Encoder

6^{th}8

^{th}

### Niven Numbers

18^{th}

### Odious Numbers

11^{th}13

^{th}11

^{th}

### Ordinal Numbers

### Pangram Grep

3^{rd}7

^{th}9

^{th}

### Pascal’s Triangle

19^{th}

### Pernicious Numbers

10^{th}

### Poker

### Prime Numbers

44^{th}8

^{th}14

^{th}131

^{st}1

^{st}

### Quine

1^{st}17

^{th}1

^{st}13

^{th}

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

### Roman to Arabic

39^{th}10

^{th}5

^{th}7

^{th}

### Rule 110

### Seven Segment

5^{th}7

^{th}

### Sierpiński Triangle

5^{th}14

^{th}

### Spelling Numbers

5^{th}7

^{th}

### Sudoku

### Ten-pin Bowling

### Tongue-twisters

### United States

### λ

### π

10^{th}5

^{th}95

^{th}15

^{th}

### τ

4^{th}3

^{rd}11

^{th}

### φ

4^{th}4

^{th}12

^{th}

### √2

### 𝑒

5^{th}3

^{rd}15

^{th}