20131211, 10:38  #1 
Feb 2013
2·229 Posts 
Number question.
I found a number in Yafu's factor.log
A prime number or possible probable prime having 11943 digits. I may have a file containing a listing of probable primes lying around somewhere, but right now I have not checked yet. The first ten digits of this number is 1448808560. The last two digits are 71. Can someone please give me advice. Apparently factordb does not take this number. Thanks! 
20131211, 10:55  #2  
Bamboozled!
"πΊππ·π·π"
May 2003
Down not across
10101011001100_{2} Posts 
Quote:
Paul 

20131211, 12:29  #3 
Feb 2013
2×229 Posts 
Are prime numbers or composite numbers always supposed to be meant for your checkbook or wallet?
Dealing with numbers is supposed to be fun if you are having an interest in the subject. Please have a look at these two numbers. Can you tell me which one is prime and which one is composite? BTW: What is missing here? Are you perhaps able to give me the third number as well and also tell me whether it is prime, or possibly composite? Here are the two sample numbers: 2147879044879841121935405312504492005851635600432202158153392313617683786 0522463887697117638217099126997978593342367353152166840435274606748401488 1268040978327338610009463489049252789936442586632275820120297391128316185 4248608520434212476260796683530707287137190597814949527590660584221727134 4834446132362827582456286472043672916030677233044796642125873574091654219 3562977151566875350961770268744214325327721569767452362139080286009082050 2404405877434285969214690243230973631838275531443187885792067446251919938 1211717163017615279900352566527118678991461272648796480867539485696061894 7524678336727199001619181567987600062098969915247851892800052895173228818 4735982555712216018831354399865644658358161366332429471576179164550448113 4145423024346718804838861904678067848181566674143425721597189977071297889 7341386077435893077207536500414775193289480994817 7314670534426732521183464250402225254351385483372413682012323770522829308 3326487789407886751802464385943511636838293365540264093084229874934494025 6172328486053708106632238473110849973657674010347612617282891969301194449 2816157216480883785939538442638304173887568242186377962393139148155659435 8410017951900120535835224207050904080380888479076370711731332149150855065 1835622481333727539369660619189753146732351250817069065328801474348542603 6325845078975145611806208891970806739150912687175551629830520350459365412 0827735863777042716852877156116844580930169724911755979403866154083703843 0009200188311929792435916690687510834207674737680048770349462192262699146 0681814037833710248216269218363214431905651213898107082817476258340526721 4010666747687455418416457698967347660465598497239360241126299417912049942 7046257810330758039139195696443447696816670956273505645008326422621387027 8839975771835757301651565847907099767889472980905385467661591027120006059 4734285644695541770014175439632914985211602168264663429852217962893226882 8782203233800042741451259617138712086528722227581909403222501134672583467 8383725223166060661066507411776418141059950215194978264914981665223420249 7013136557994006785136628078627657916083070816717225665327856981917141673 3859255422155510110946206417438087357549088640350274226255739714938859029 3099835946818772284794965678737801380768372274689518468801796552381586593 4715618297757081203596579488411136002971238903342334662027690138803840983 1267305662337805408199417615988749655816999982177572379635566782395282021 10968528897 Last fiddled with by storflyt32 on 20131211 at 12:29 
20131211, 13:45  #4 
Romulan Interpreter
"name field"
Jun 2011
Thailand
9,787 Posts 
They are both prime, one need ~40 milliseconds to prove it. It took me longer to copy/paste them between pari's accolades (due to the fact that you used hard line separation, so I had to put them in accolades).
So what? 
20131211, 14:14  #5  
Nov 2003
1110100100100_{2} Posts 
Quote:


20131211, 14:46  #6  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
10AC_{16} Posts 
Quote:
Basically, any advice about this number depends heavily on what sort of number it is. (and, y'know, what sort of advice you want, which you haven't said) What special form or properties, if any, does it have? Last fiddled with by MiniGeek on 20131211 at 14:48 

20131211, 15:40  #7 
"William"
May 2003
New Haven
2^{6}·37 Posts 
These are 46^512+1 and 1036^512+1.
Factordb has thousands of numbers of this size  what leads you to say "Apparently factordb does not take this number?" 
20131211, 16:04  #8 
Romulan Interpreter
"name field"
Jun 2011
Thailand
9,787 Posts 
I think he is trying to paste them into fdb in the same way as in the post, with <enter> after every 80 characters or so (see my post above) and of course, fdb believes the "each number on a line" stuff

20131211, 16:50  #9  
Nov 2003
2^{2}·5·373 Posts 
Quote:
BTW, this is in the wrong subforum. Last fiddled with by R.D. Silverman on 20131211 at 16:51 Reason: Added a sentence 

20131211, 17:37  #10  
Bamboozled!
"πΊππ·π·π"
May 2003
Down not across
2^{2}·3·11·83 Posts 
Quote:
However, my question was real. Why are these particular numbers interesting to you? In particular, why should anyone else be interested enough in them to take the effort to test them for you, or give you any other free assistance for that matter? 

20131211, 19:03  #11 
Oct 2006
vomit_frame_pointer
2^{3}·3^{2}·5 Posts 
Yes, please
I would very much like to use these numbers for my checkbook and wallet, although, for my wallet, I would need extremely large denomination currency.

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