posted by unowen

15 can be written as the difference between two positive perfect squares:

Which of the following numbers cannot be written as the difference of two positive perfect squares?


  1. PsyDAG

    These are not differences.

    17 = 4^2 + 1^2

    16 = 2^2 * 2^2

    20 = 4^2 + 2^2

    18 = 3^2 + 3^2

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