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Old 2008-10-04, 23:04   #870
jinydu
 
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After the M44 discovery... (http://www.mersenneforum.org/showthr...randall&page=2)

Quote:
Originally Posted by Richard Crandall
You should also know that the PSI company is right now trying to manufacture the customary poster for M32582657.

(Note I said "trying"...the region of 1 (that's o-n-e) point font is getting, I am told, near impossible...at least for ink on paper... you will all hear shortly (a week maybe?) on whether there has been success)
Quote:
Originally Posted by Richard Crandall
Colleagues: The newest prime's poster is now available at www.perfsci.com

Incidentally, the printing technology is truly pressed (no pun intended) at this prime size. This will likely be the very last prime printing done this way.

There have been several clever suggestions from you, for future printing issues. Ideas such as allowing arbitrary poster width, even "dead sea scrolls" of a primes, etc. are all
welcome. There is another new idea which is that PSI starts making silicon chips, and would offer an integrated museum-quality microscope display. One could go up to a billion digits that way, but of course such a "chip poster" would cost $100s.

Once again I apologize out of hand for the high price of all the current posters including the newest. The prime-poster business is tough going, is the only defense!

R. E. Crandall
I guess those fears haven't come to pass, at least for now... Did Crandall have anything to say on the mailing list this time?

Last fiddled with by jinydu on 2008-10-04 at 23:07
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Old 2008-10-06, 05:56   #871
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I was actually hoping for a reply to my last post...

42949 user accounts (perhaps we lost some of the newcomers)
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Old 2008-10-07, 05:39   #872
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The picture of a poster on page http://www.perfsci.com/wall-art.asp has been changed.

42906 registered user accounts.

Struggling to keep this thread alive.
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Old 2008-10-07, 05:52   #873
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Quote:
Originally Posted by jinydu View Post
Struggling to keep this thread alive.
Even holy _water_ doesn't last forever.
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Old 2008-10-07, 05:58   #874
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... Loved the new photo!
that's a great answer to the evil xkcd cartoons' author (cf. "How it works")
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Old 2008-10-11, 00:19   #875
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This is a reply email I got from Richard Crandall:

Quote:
Originally Posted by Richard Crandall
On prime-number posters at
www.perfsci.com
the posters have gotten progressively more difficult
to manufacture.
The current 12978189-digit prime, namely 2^43112609−1,
is printed with numerals that are each boxed by dimensions

0.7 x 1.0

in units of 1/72 inch. So, each numeral is about 1/72 inch tall.

Another way to say this is, the magnified digit-circle on the
Home page at www.perfsci.com is about 7:1 magnification.

This is near the limit of the printing technology used. One supposes
that
a prime of say 20 million digits will require a new medium;
perhaps something lithographically inscribed and viewed under a
microscope.

R. Crandall
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Old 2008-10-11, 05:06   #876
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Quote:
Originally Posted by jinydu View Post
This is a reply email I got from Richard Crandall:
A 24" tall banner that runs 120" would be nice, great for a classroom.
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Old 2008-10-12, 02:09   #877
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*Takes another batch of holy water

I've wondered how they've managed to maintain the same poster and font size, even as the number of digits has increased. Guessing from the email, perhaps it is by shrinking the distance between digits and between lines.

Judging by the 20 million digits figure, it seems like the current printing technique will continue to be viable for quite some time.
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Old 2008-10-12, 02:59   #878
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On some of the earlier posters you can see the digits, if you look real hard.
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Old 2008-10-13, 17:57   #879
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Quote:
Originally Posted by jinydu View Post
*Takes another batch of holy water

I've wondered how they've managed to maintain the same poster and font size, even as the number of digits has increased. Guessing from the email, perhaps it is by shrinking the distance between digits and between lines.

Judging by the 20 million digits figure, it seems like the current printing technique will continue to be viable for quite some time.
AFAIK they've been continually shrinking the font, starting with M13466917.
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Old 2008-10-13, 21:58   #880
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We want a poster of M12.
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