### 12 Days of Christmas

2^{nd}11

^{th}

### 99 Bottles of Beer

2^{nd}21

^{st}

### Abundant Numbers

7^{th}8

^{th}

### Arabic to Roman

### Brainfuck

6^{th}

### CSS Colors

### Christmas Trees

11^{th}

### Cubes

6^{th}

### Diamonds

15^{th}

### Divisors

21^{st}20

^{th}

### Emirp Numbers

9^{th}29

^{th}

### Evil Numbers

16^{th}10

^{th}29

^{th}15

^{th}

### Fibonacci

91^{st}13

^{th}7

^{th}

### Fizz Buzz

34^{th}58

^{th}18

^{th}22

^{nd}52

^{nd}55

^{th}

### Happy Numbers

11^{th}27

^{th}

### Leap Years

24^{th}11

^{th}22

^{nd}

### Leyland Numbers

### Lucky Tickets

### Morse Decoder

10^{th}

### Morse Encoder

### Niven Numbers

29^{th}13

^{th}11

^{th}24

^{th}

### Odious Numbers

14^{th}7

^{th}28

^{th}

### Ordinal Numbers

10^{th}

### Pangram Grep

23^{rd}

### Pascal’s Triangle

12^{th}36

^{th}

### Pernicious Numbers

16^{th}26

^{th}

### Poker

### Prime Numbers

18^{th}34

^{th}17

^{th}

### Quine

1^{st}21

^{st}52

^{nd}24

^{th}8

^{th}18

^{th}30

^{th}33

^{rd}11

^{th}113

^{th}15

^{th}20

^{th}28

^{th}16

^{th}25

^{th}19

^{th}218

^{th}19

^{th}64

^{th}24

^{th}11

^{th}

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

### Roman to Arabic

### Rule 110

7^{th}

### Seven Segment

2^{nd}14

^{th}

### Sierpiński Triangle

17^{th}

### Spelling Numbers

### Sudoku

### Ten-pin Bowling

### United States

10^{th}

### λ

2^{nd}5

^{th}9

^{th}

### π

8^{th}13

^{th}74

^{th}17

^{th}

### τ

8^{th}9

^{th}13

^{th}

### φ

3^{rd}6

^{th}6

^{th}8

^{th}

### √2

2^{nd}8

^{th}5

^{th}6

^{th}

### 𝑒

3^{rd}15

^{th}8

^{th}5

^{th}8

^{th}8

^{th}8

^{th}7

^{th}42

^{nd}11

^{th}8

^{th}11

^{th}2

^{nd}15

^{th}8

^{th}75

^{th}17

^{th}19

^{th}3

^{rd}3

^{rd}