### 12 Days of Christmas

5^{th}

### 99 Bottles of Beer

### Abundant Numbers

1^{st}

### Arabic to Roman

### Arrows

### ASCII Table

1^{st}

### brainfuck

### Catalan Numbers

1^{st}

### Catalan’s Constant

### Christmas Trees

1^{st}

### Collatz

4^{th}

### CSS Colors

1^{st}

### Cubes

### Diamonds

### Divisors

1^{st}1

^{st}

### Emirp Numbers

1^{st}

### Emojify

### Evil Numbers

1^{st}

### Fibonacci

10^{th}1

^{st}1

^{st}

### Fizz Buzz

1^{st}1

^{st}

### Foo Fizz Buzz Bar

1^{st}1

^{st}

### Fractions

1^{st}

### Happy Numbers

1^{st}

### Happy Numbers (Long)

1^{st}

### Hexdump

### Intersection

### ISBN

### Jacobi Symbol

### Kolakoski Constant

### Kolakoski Sequence

1^{st}6

^{th}

### Leap Years

### Levenshtein Distance

1^{st}

### Leyland Numbers

1^{st}

### Look and Say

### Lucky Numbers

### Lucky Tickets

### Morse Decoder

### Morse Encoder

### Musical Chords

### Niven Numbers

5^{th}

### Niven Numbers (Long)

### Number Spiral

### Odious Numbers

1^{st}

### Ordinal Numbers

### Pangram Grep

1^{st}

### Pascal’s Triangle

1^{st}

### Pernicious Numbers

1^{st}

### Poker

### Prime Numbers

4^{th}1

^{st}1

^{st}

### Prime Numbers (Long)

1^{st}1

^{st}

### Proximity Grid

### QR Decoder

### Quine

1^{st}

### Recamán

### Reverse Polish Notation

1^{st}