- Congratulations on these records. Sometimes we need a bit of luck when searching for primes.

Gary Chaffey

Jens Kruse Andersen <jens.k.a@...> wrote:

CC12 of the 2nd kind, starting at 56 digits:

(8428860*127# + 212148902055090) * 2^n + 1, for n = 0..11

It is also record for CC11 - which is what I searched!

The lucky bonus prime improved the record for 12 simultaneous

primes from 44 to 58 digits:

http://hjem.get2net.dk/jka/math/simultprime.htm#history12

The current records for 9, 11, 12 and 13 primes were set

in fortunate searches for one less prime.

A more modest record CC12 of the 1st kind, starting at 42 digits:

(4431659*89# + 440181861259140) * 2^n - 1, for n = 0..11

This was found earlier and the best overall CC12 at the time.

The GMP library made prp tests. Marcel Martin's Primo proved all primes.

And congratulations to Gary Chaffey:> I have just found the following record Cunningham Chain (1st Kind) length 5

--

>

> (2^n)*5864262128*1201#-1 For n=0..4

Jens Kruse Andersen

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[Non-text portions of this message have been removed] - Congrats to both of you!

I updated the record list in the primenumbers file section.

@Jens:

Now you had the luck I had before. :)

I'm curios which record stays longer, your CC12 or my CC9. ;-)

Regards,

Dirk

--- In primenumbers@yahoogroups.com, Gary Chaffey <garychaffey2@...>

wrote:>

when searching for primes.

> Congratulations on these records. Sometimes we need a bit of luck

> Gary Chaffey

primes.

>

> Jens Kruse Andersen <jens.k.a@...> wrote:

> CC12 of the 2nd kind, starting at 56 digits:

> (8428860*127# + 212148902055090) * 2^n + 1, for n = 0..11

>

> It is also record for CC11 - which is what I searched!

> The lucky bonus prime improved the record for 12 simultaneous

> primes from 44 to 58 digits:

> http://hjem.get2net.dk/jka/math/simultprime.htm#history12

> The current records for 9, 11, 12 and 13 primes were set

> in fortunate searches for one less prime.

>

> A more modest record CC12 of the 1st kind, starting at 42 digits:

> (4431659*89# + 440181861259140) * 2^n - 1, for n = 0..11

> This was found earlier and the best overall CC12 at the time.

>

> The GMP library made prp tests. Marcel Martin's Primo proved all

>

Kind) length 5

> And congratulations to Gary Chaffey:

> > I have just found the following record Cunningham Chain (1st

> >

Number theory

> > (2^n)*5864262128*1201#-1 For n=0..4

>

> --

> Jens Kruse Andersen

>

>

>

>

> Unsubscribe by an email to: primenumbers-unsubscribe@yahoogroups.com

> The Prime Pages : http://www.primepages.org/

>

>

>

>

>

> SPONSORED LINKS

> Mathematics education Mathematics and computer science

>

Service.

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>

>

> Visit your group "primenumbers" on the web.

>

> To unsubscribe from this group, send an email to:

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>

> Your use of Yahoo! Groups is subject to the Yahoo! Terms of

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new Yahoo! Security Centre.

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> [Non-text portions of this message have been removed]

>