20221120, 00:36  #1 
Nov 2022
2·3 Posts 
msieve 1.53 refusing to work on factoring a number
I'm running msieve 1.53 downloaded from sourceforge on Windows 10
With input number: Code:
592882521637563371255988933569562526270730127954281578371022521620306952310392510665598219753586428161197028620328266639362113343141594645707449734951628116538375683863626055767435783194371195814008292968003192702648520406175128014572590661900720692085587865317 Code:
Msieve v. 1.53 (SVN 1005) Sun Nov 20 01:28:58 2022 random seeds: 5f88e2c0 38e923d1 factoring 592882521637563371255988933569562526270730127954281578371022521620306952310392510665598219753586428161197028620328266639362113343141594645707449734951628116538375683863626055767435783194371195814008292968003192702648520406175128014572590661900720692085587865317 (261 digits) searching for 15digit factors commencing number field sieve (261digit input) commencing number field sieve polynomial selection polynomial degree: 6 max stage 1 norm: 6.21e+033 max stage 2 norm: 9.75e+033 min Evalue: 0.00e+000 poly select deadline: 1079999 time limit set to 300.00 CPUhours expecting poly E from 8.34e019 to > 9.59e019 searching leading coefficients from 1 to 164176515 deadline: 3200 CPUseconds per coefficient randomizing rational coefficient: using piece #41 of 450 coeff 12 specialq 72547801  74361496 other 20694795  49667508 aprogs: 577224 entries, 2323662 roots 12 68353482965301129500575 19155694413565757733110803778099867582806616 :line minimize failed 12 85124664293115719030869 19155694413565876261099613116039675398342599 :line minimize failed :line minimize failed :line minimize failed 12 83885369207355693831131 19155694413565766216761394420441478348364978 :12 56098656403317214940749 19155694413565774792238272684407892147945377 :line minimize failed :line minimize failed :line minimize failed and running with no extra arguments (msieve153 v <number>) this is the output: Code:
searching for 15digit factors commencing quadratic sieve (261digit input) using multiplier of 7 using generic 32kb sieve core sieve interval: 400 blocks of size 32768 processing polynomials in batches of 1 using a sieve bound of 42921973 (1299417 primes) using large prime bound of 4294967295 (31 bits) using double large prime bound of 218437776016143360 (5158 bits) using trial factoring cutoff of 58 bits fatal error: poly selection failed Does anyone know why is this happening? I cleared the directory of all msieve.fb .dat and relevant files. Last fiddled with by IamMusavaRibica on 20221120 at 00:36 
20221120, 01:09  #2  
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
274B_{16} Posts 
Quote:
msieve if called in commandline like you did will default to QS (quadratic sieve); this is not going to work with a 261digit input. msieve is a very good tool when used correctly, but it is not a tool that will do everything for you. Instead, the shortest recipe is  install another tool  yafu. (It actually uses msieve, as well, internally) 

20221120, 03:57  #3  
"99(4^34019)99 palind"
Nov 2016
(P^81993)SZ base 36
2×7×263 Posts 
Quote:
Last fiddled with by sweety439 on 20221120 at 03:57 

20221120, 16:41  #4 
Sep 2009
2^{2}·607 Posts 
According to factordb it's (2^1274958)/548587400055100020569633729957403536012167283572060233678280830124443453419873609038059209411506178791106026467603646596378.
But SNFS is probably slower than GNFS for it. So if you have to ask about how to factor it then it's too big a job for you (I could not do it even with help from NFS@Home). It could be simplified to (2^1273479)/274293700027550010284816864978701768006083641786030116839140415062221726709936804519029604705753089395553013233801823298189 but that doesn't make it significantly easier to factor. 
20221120, 23:51  #5 
Nov 2022
2×3 Posts 
Thanks everyone
The number is aswell equal to (2^12777664)/4388699200440800164557069839659228288097338268576481869426246640995547627358988872304473675292049430328848211740829172771024 Yafu was a bit complicated to set up but I'll try again I guess 
20221121, 04:58  #7  
"Curtis"
Feb 2005
Riverside, CA
13013_{8} Posts 
Quote:
Rather than explain why and have you ignore me too, I'll just advise you to learn to factor numbers by starting small and working your way up. Try a 100digit number, then 110, then 120, then 130. Note how the time taken scales up every time you jump 10 digits, and extend that scaling to your 260 digit number. You'll be disappointed in the forecast for a 260 digit factorization. 

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