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    Another way to solve this problem

    Find a Prime
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    • LorazhangL
      Lorazhang M0★ M1★ M2 M3 M4★ M5★
      last edited by

      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

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