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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: The next exercise
Date: Fri, 16 Dec 2022 02:16:59 +0100
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Michael Heerdegen <michael_heerdegen@web.de> writes:

> At least I know now it's not a prime, since all integers of the form
> 2^2^n - 1 are divisible by 5.

I meant for n>=2 of course (n=1 is the only exception).

Michael.