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Old 2018-01-24, 21:58   #3
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"Forget I exist"
Jul 2009

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Originally Posted by lukerichards View Post

I've used P95 to identify a number of smallish PRPs. They are not of the form 2p-1.

One in particular is 3^{19217} - 2 which I believe has 9169 digits. I assume, in a world tackling the search for Megaprimes, that the fact this is not available on The Prime Database means that this is composite. However, I'd like to test this myself...

Is it possible to do this with P95? To get a proof one way or another. Or is there some alternative software which can test a prime like this?


You can even use your brain ( literally proved it in my head it doesn't have divisors below 19) modular tricks can be used.
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