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A087671
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Number of subsets S of {0,1,2,...,n-1} which are idempotent under squaring modulo n, where S*S mod n = {x*y mod n|x,y in S}.
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0
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2, 4, 6, 8, 8, 27, 10, 26, 18, 43, 10, 146, 14, 59, 107, 114, 12, 184, 14, 406, 142, 59
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