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• A Cube and a Square
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• Find a Prime
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  L

  Since 2021=2025-4=45^2-2^2, which means that 2021 can be written as (45+2)(45-2)=43*47. It's more faster than guessing the numbers and it's more easy to memorize. Although not all numbers can be solved that way

• 1's and 0's
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• Bonus: Constructing a Set of Nonprimes
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