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Old 2021-09-19, 17:19   #5
Dobri
 
"刀-比-日"
May 2018

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For Y = 1 and X=7(9^Y)+1, n = 72,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,227 is a prime.

For Y = 2 and X=7(9^Y)+1, n = 72,222,...,222,227 =
12,391 × 173,429 × 9,639,563 × 53,804,376,883 × 72,037,926,256,979 × ... is composite.

For Y = 3 and X=7(9^Y)+1, n = 72,222,...,222,227 = 1,352,773 × ... is composite.

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Last fiddled with by Dobri on 2021-09-19 at 17:24
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