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Find the least positive four-digit solution r of the congruence r^2 + 4r + 4 == 1 (mod 55) .

 Oct 26, 2020
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The least positive four-digit solution r =1009, so that: [1009^2 + 4*1009 + 4]=1,022,121 mod 55==1

 Oct 26, 2020

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