CRHillman

12 Days of Christmas

99 Bottles of Beer

Abundant Numbers

Arrows

Christmas Trees

Diamonds

Divisors

Emirp Numbers

Evil Numbers

Fibonacci

Fizz Buzz

Happy Numbers

Intersection

Leap Years

Leyland Numbers

Niven Numbers

Odious Numbers

Pangram Grep

Pascal’s Triangle

Pernicious Numbers

Prime Numbers

Seven Segment

Sierpiński Triangle

π

τ

φ

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