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Old 2020-09-17, 22:59   #6
Uncwilly
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So

30526410117453380369827961 is a semi-prime
gcf(a-1,b-1) = 8 a free fact granted by me.

Does this help you find a and b?

n-1 = 2^3×5×17×5827×1288671127×5978327543
so the gcf could be any combination of 1 or more of those.
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