mersenneforum.org is confusing
 Register FAQ Search Today's Posts Mark Forums Read

 2014-10-31, 00:38 #1 zakary   Oct 2014 1 Posts is confusing my numbre with 101 019 520 digits. how can i display it in internet??
 2014-10-31, 00:47 #2 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 265D16 Posts Just type it into a word document, zip it and post it. Word documents zip much better than plain text files!
 2014-10-31, 00:48 #3 ixfd64 Bemusing Prompter     "Danny" Dec 2002 California 25×7×11 Posts Inb4miscmath.
2014-10-31, 02:44   #4
Mini-Geek
Account Deleted

"Tim Sorbera"
Aug 2006
San Antonio, TX USA

7·13·47 Posts

Quote:
 Originally Posted by zakary my numbre with 101 019 520 digits. how can i display it in internet??
Easy: just write 2^335,579,581-1. At least, I'm guessing that's your "prime" number (plus or minus 2), since that's a Mersenne number with exactly that many digits (indeed, the only one with a prime exponent in a good range around that size). It's even without known factors (even after I pushed its TF 5 bits (and counting) higher than it was), so your crank score isn't quite as high as it could've been. Congrats on that!

Last fiddled with by Mini-Geek on 2014-10-31 at 02:53

 2014-10-31, 03:21 #5 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 265D16 Posts Why not 2^(27!+1)-1 ? It is surely bigger and has no known factors... yet? Must be prime, too, and much bigger!
2014-10-31, 03:53   #6
LaurV
Romulan Interpreter

"name field"
Jun 2011
Thailand

100110111010012 Posts

Quote:
 Originally Posted by Batalov Why not 2^(27!+1)-1 ? It is surely bigger and has no known factors... yet? Must be prime, too, and much bigger!
because it has far more digits than claimed?

2014-10-31, 05:19   #7
VBCurtis

"Curtis"
Feb 2005
Riverside, CA

527710 Posts

Quote:
 Originally Posted by LaurV because it has far more digits than claimed?
Batalov was asking the OP, not the guesser.

2014-10-31, 06:02   #8
Primeinator

"Kyle"
Feb 2005
Somewhere near M52..

3×5×61 Posts

Quote:
 Originally Posted by Batalov Why not 2^(27!+1)-1 ? It is surely bigger and has no known factors... yet? Must be prime, too, and much bigger!
Out of curiosity ...

Digits in 2^p -1 are easy to calculate as ceiling_(p*log(2))

Is there a way to easily calculate the digits in something like x! ?

if P = 27! +1 it is clear that 2^p is much, much, much bigger than 100 M digits. I would like to be able to tell how many digits...

Last fiddled with by Primeinator on 2014-10-31 at 06:03

 2014-10-31, 06:36 #9 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 7×23×61 Posts Code: (23:33) gp > \p 30 realprecision = 38 significant digits (30 digits displayed) (23:34) gp > (27!+1)*log(2)/log(10) %4 = 3277876323445093851079375875.23 => It has 3277876323445093851079375876 decimal digits, but it has the usual properties of Mersenne's. So the factors are of 2kp+1 form, and $\pm 1$ (mod 8). I haven't found a factor, but it doesn't mean someone couldn't find one. It could be fun! P.S. And yes, I was suggesting a parallel to the OP's logic: "No factors are known, therefore it is surely a prime". P.P.S. There is a Stirling formula for a pretty good estimate of the value of x! Last fiddled with by Batalov on 2014-10-31 at 06:42
 2014-10-31, 06:40 #10 LaurV Romulan Interpreter     "name field" Jun 2011 Thailand 7×1,423 Posts 3277876323445093851079375876 decimal digits. (an idiot throws a stone in the lake and 100 sane scientists try to get it out... (romanian proverb)) [edit, grrr, I am always a step behind, hehe... ] [edit 2: and yes, by idiot I was referring to OP, and not to Serge ] [edit 3: 2^M48-1 may be larger... or M48#+1 ? (we had this discussion at least ten times on this forum, now other people will jump in and say larger possible primes)] [edit 4: scrap M48#, we can not construct it, as we don't know all primes up to it ] Last fiddled with by LaurV on 2014-10-31 at 06:49
2014-10-31, 06:55   #11
Uncwilly
6809 > 6502

"""""""""""""""""""
Aug 2003
101×103 Posts

244218 Posts

Quote:
 Originally Posted by Mini-Geek Easy: just write 2^335,579,581-1. At least, I'm guessing that's your "prime" number (plus or minus 2), since that's a Mersenne number with exactly that many digits (indeed, the only one with a prime exponent in a good range around that size). It's even without known factors (even after I pushed its TF 5 bits (and counting) higher than it was), so your crank score isn't quite as high as it could've been. Congrats on that!
If you haven't started a P-1 on it, I might be able to do that on one of my borg.

 Similar Threads Thread Thread Starter Forum Replies Last Post VictordeHolland Hardware 1 2018-03-05 17:37 swl551 GPU Computing 5 2013-11-30 14:19 ramgeis PrimeNet 2 2013-06-09 23:53 Uncwilly Lounge 0 2010-12-29 01:27

All times are UTC. The time now is 14:01.

Wed May 18 14:01:28 UTC 2022 up 34 days, 12:02, 0 users, load averages: 1.53, 1.52, 1.51