Message 6764 from Yahoo.Groups.Primeform
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Date: Tue, 27 Dec 2005 14:20:43 -0000
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From: "p_jobling" <Paul.Jobling@...>
Subject: Re: Record Palindrome
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--- In primeform@yahoogroups.com, "Paul Underwood"
<paulunderwood@m...> wrote:
>
> Hi,
>
> congrats to Paul Jobling for his record-breaking 150,007 digit
palindrome:
> http://primes.utm.edu/primes/page.php?id=76550
> topping the list:
> http://primes.utm.edu/top20/page.php?id=53

Thank you Paul; as I have said to Harvey, it was a really /lucky/
find. After Harvey broke the record recently, I decided to throw
together a quick sieve just for the sake of doing it - my current
search has been dragging on for the best part of a year, and I wanted
to break up the monotomy. I threw the sieve together and sieved the range

10^(75000*2+6)+10^75000*P7+1

where P7 is a 7 digit palindrome. After sieving for a day and a half,
I threw the numbers at PFGW, though I knew that (a) it was going to
be two weeks of PRPing, and (b) for an even chance of a prime, about
200 days PRPing was required. But if you don't look you will never
find, eh? It was a neat Christmas present from Poisson.

> As with Harvey's previous record, I think that these trinomials can be
> crunched quicker by using Phil C's own C program ;-)

An intriguing idea; what does Phil say on this?

Regards,

Paul.


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