B.B.C. Article
The largest known prime number has been discovered by a computer at a university in Missouri in the US.
Prime numbers - such as two, three, five and seven - are divisible only by themselves and one, and play an important role in computer encryption.
The new prime is more than 22 million digits long, five million longer than the previous largest known prime.
Primes this large could prove useful to computing in the future.
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Largest known prime number discovered in Missouri
22,338,618 digits long
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Largest known prime number discovered in Missouri
#1 
by DougC » Jan 22, 2016 12:25 am
http://www.bbc.co.uk/news/technology-35361090
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Re: Largest known prime number discovered in Missouri
#2 by I'm With Stupid » Jan 22, 2016 4:55 am
What was it doing in Missouri?
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Re: Largest known prime number discovered in Missouri
#3 by laklak » Jan 22, 2016 4:56 am
Probably trying to get a flight out.
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Re: Largest known prime number discovered in Missouri
#4 by VazScep » Jan 22, 2016 8:29 am
What sort of computer and how much time would you need to confirm this result?
Here we go again. First, we discover recursion.
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Re: Largest known prime number discovered in Missouri
#5 by DavidMcC » Jan 22, 2016 12:26 pm
I'm With Stupid wrote:What was it doing in Missouri?
Perhaps it's a tourist attraction.
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Re: Largest known prime number discovered in Missouri
#6 by igorfrankensteen » Jan 22, 2016 1:48 pm
Missouri's semi-official motto is that it is "the Show Me State."
Unfortunately, there's not very much IN Missouri, that I would like to be shown.
Unfortunately, there's not very much IN Missouri, that I would like to be shown.
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Re: Largest known prime number discovered in Missouri
#7 by John Platko » Jan 22, 2016 1:59 pm
VazScep wrote:What sort of computer and how much time would you need to confirm this result?
From
The primality proof took 31 days of non-stop computing on a PC with an Intel I7-4790 CPU. To prove there were no errors in the prime discovery process, the new prime was independently verified using both different software and hardware. Andreas Hoglund and David Stanfill each verified the prime using the CUDALucas software running on NVidia Titan Black GPUs in 2.3 days. David Stanfill verified it using ClLucas on an AMD Fury X GPU in 3.5 days. Serge Batalov also verified it using Ernst Mayer's MLucas software on two Intel Xeon 18-core Amazon EC2 servers in 3.5 days.
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Re: Largest known prime number discovered in Missouri
#8 by DavidMcC » Jan 22, 2016 1:59 pm
igorfrankensteen wrote:...
Unfortunately, there's not very much IN Missouri, that I would like to be shown.
Except, perhaps, the largest prime nmber in the world!
...
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Re: Largest known prime number discovered in Missouri
#9 by laklak » Jan 22, 2016 2:10 pm
Talk about a roadside attraction. SEE the World's LARGEST Prime Number!
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The sky is falling! The sky is falling! - Chicken Little
I never go without my dinner. No one ever does, except vegetarians and people like that - Oscar Wilde
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Re: Largest known prime number discovered in Missouri
#10 by BlackBart » Jan 22, 2016 3:04 pm
Noomerical varmits we calls em
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Re: Largest known prime number discovered in Missouri
#11 by LucidFlight » Jan 22, 2016 3:08 pm
They must have a massive computer screen to show it on.
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Re: Largest known prime number discovered in Missouri
#12 by laklak » Jan 22, 2016 3:16 pm
COMING SOON! Pi to 1.0 x 10^100 digits!
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The sky is falling! The sky is falling! - Chicken Little
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Re: Largest known prime number discovered in Missouri
#13 by kennyc » Jan 23, 2016 3:00 am
I'm With Stupid wrote:What was it doing in Missouri?
Either it got sucked in: http://www.atlasobscura.com/places/vacu ... ory-outlet
or was looking for a place to sit: http://www.atlasobscura.com/places/worl ... king-chair
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Re: Largest known prime number discovered in Missouri
#14 by DougC » Jan 23, 2016 5:18 am
I think Texas will try to out-do this, because as we know,
EVERYTHING IS BIGGER IN TEXAS.
EVERYTHING IS BIGGER IN TEXAS.
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Re: Largest known prime number discovered in Missouri
#15 by Calilasseia » Jan 23, 2016 11:52 am
laklak wrote:COMING SOON! Pi to 1.0 x 10^100 digits!
This might actually happen quicker than you think. This is because mathematicians have devised a mechanism for determining arbitrary digits of π without having to compute all the previous digits. The method is known, after its inventors, as the Bailey-Borwein-Plouffe algorithm. They've since demonstrated that the method can be applied to other transcendental numbers as well, such as e and ln(2). If all you need to do, is crank repeatedly through a rote algorithm that involves nothing more computationally expensive than division, courtesy of it involving rational terms, you can generate any number of digits of the number in question, and the only limitation, ultimately, is when you get bored of doing this.
This is why calculations of π have seen a surge recently, and the number has now been evaluated to 1018 digits.
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Re: Largest known prime number discovered in Missouri
#16 by logical bob » Jan 23, 2016 12:00 pm
Calilasseia wrote:This is why calculations of π have seen a surge recently, and the number has now been evaluated to 1018 digits.
But why? It's neither practically useful nor theoretically interesting.
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Re: Largest known prime number discovered in Missouri
#17 by DavidMcC » Jan 23, 2016 12:54 pm
I think it is used to generate random number sequences, because there is no order in the digits.
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Re: Largest known prime number discovered in Missouri
#18 by scott1328 » Jan 24, 2016 1:28 am
What I want to no is: have they found any 11x11 pictograms in the base 11 expansion of pi?
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Re: Largest known prime number discovered in Missouri
#19 by CdesignProponentsist » Jan 24, 2016 2:03 am
laklak wrote:COMING SOON! Pi to 1.0 x 10^100 digits!
I hear they are clearing out several universes to make room for it. Expect a few refugees.
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Re: Largest known prime number discovered in Missouri
#20 by newolder » Mar 07, 2018 9:23 pm
Here's a not very large prime number -> 6400 digits, all 9s except 1 8. Couldn't find another topic to post it in...
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