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12 Days of Christmas

99 Bottles of Beer

Abundant Numbers

Abundant Numbers (Long)

Arithmetic Numbers

Arrows

Christmas Trees

Collatz

Divisors

Emirp Numbers

Emirp Numbers (Long)

Emojify

Evil Numbers

Evil Numbers (Long)

Factorial Factorisation

Farey Sequence

Fibonacci

Fizz Buzz

Foo Fizz Buzz Bar

Forsyth–Edwards Notation

Fractions

Happy Numbers

Happy Numbers (Long)

ISBN

Leap Years

Look and Say

Morse Encoder

Niven Numbers

Niven Numbers (Long)

Number Spiral

Odious Numbers

Ordinal Numbers

Pangram Grep

Pascal’s Triangle

Pernicious Numbers

Prime Numbers

Prime Numbers (Long)

Quine

Recamán

Seven Segment

Smith Numbers

Time Distance

Tongue-twisters

United States

π

φ

√2

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