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## Re: [PrimeNumbers] Two questions: Mirror sequence reference and 6n+11= square?

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• In a message dated 29/02/04 16:17:28 GMT Standard Time, ... Bill: I don t understand Question 1, but can address your Question 2. Suppose there is a solution:
Message 1 of 2 , Feb 29, 2004
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In a message dated 29/02/04 16:17:28 GMT Standard Time,
billroscarson@... writes:

> Question 2: Is there a way to determine if the function "6n+11" ever
> forms a perfect square for some n (n=1,2,3,4 etc to any m), other
> than trial and error? I have tried a few thousand n's with negative
> results, but thought I'd ask if there is a better way before I do a
> more exhaustive check.
>
>

Bill: I don't understand Question 1, but can address your Question 2.

Suppose there is a solution: x^2 = 6*n+11.
Then x^2 = 2 mod 3.
But this is impossible, by enumerating the 3 possible cases:-
x mod 3 x^2 mod 3
0 0
1 1
2 1
So there is no solution..

In technical terms: "2 is a quadratic nonresidue mod 3".

-Mike Oakes

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