OEIS link for a description of lunar arithmetic

Simply take the larger digit when adding and take the smaller digit when multiplying.

Example

        15866
     X    147
     _________
        15766
       14444
    + 11111
    __________
      1145766
Solve

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Last Solution submitted on Nov 14, 2025

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George Berken Pauli Huusari Mehdi Dehghan Abrar

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