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Quadrootles (Posted on 2020-01-17)

Consider a non-empty set of positive integers M. We know, that when some x is in M, then so are 4x and [sqrt(x)].

Determine all integers in M.

Note: For a real number x, [x] denotes the largest integer, that is smaller or equal to x.

See The Solution Submitted by JLo

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