98^663+663^98 is primes (was: Re: [PrimeNumbers] a^b+b^a is PRP!)
Paul Leyland wrote:
> Andrey Kulsha wrote:yesterday-evening, I threw Titanix at 98^663+663^98, and
> > This is a complete list of prp's of the form a^b+b^a, where
> > 1<a<b<1001:
> I posted to this very forum exactly the same list on Thursday 22nd
> February under the Subject: "Primes and strong pseudoprimes of the form
> Many of the primes were proved by me years ago, and I had two in the
> prime record tables until they were re-catalogued as uninteresting.
> I'd be interested in seeing some of them proved prime --- the ones I
> never got around to completing!
this morning it reported the following:
Time: 7h 16mn 15s
Candidate certified prime
I just took one from the list to see how much time it would
take to be certified. I haven't checked the certificate yet,
but that can be done afterwards.
So, Paul, in order not to do any work duplication, do you have
a list of the proven primes you found?
Andrey, one down, several more to go :-)
Christ van Willegen
> So, Paul, in order not to do any work duplication, do you haveYes, they appear in the list I posted here a few months ago.
> a list of the proven primes you found?
Rather than cluttering up the entire membership's mailboxes with a
duplicate posting, I'll send a personal copy.
- I have not been able to find my extended lists of strong pseudoprimes of
the form x^y+y^x. I'm restarting the search from the largest still
available to me, (1015,384).
More will be posted when reasonable progress has been made.
>I have not been able to find my extended lists of strong pseudoprimes ofI've already searched up to y=1227...
>the form x^y+y^x. I'm restarting the search from the largest still
>available to me, (1015,384).
Would you start the search from y=1501 please?