20101005, 16:55  #386 
Tribal Bullet
Oct 2004
2×3×19×31 Posts 
Maybe flip rlim and alim? The rational norms will probably be larger for this input...

20101005, 17:43  #387 
Jun 2003
3·5·17·19 Posts 
Considering that too large an FB is more benign than too small, I'd suggest to bump both of them to 2^241. And probably start sieving from lower specialq (say 3 mil?). Siever 13e or 14e  at this size, it's probably a wash.
Last fiddled with by axn on 20101005 at 17:46 
20101005, 19:37  #388 
Sep 2009
2·3·331 Posts 
The alim of 8000000 was because factMsieve.pl lowers alim to the start of the range it is sieving from.
I've restarted with alim and rlim just under 2^24 from q0: 3e6 and I'm getting a better yield even though alim gets lowered to 3e6. Hopefully the yield will rise further as alim rises. The numbers with exponent 16 seem the hardest to handle. I'm almost wondering what an inverted octic would yield (at a guess even worse though). But I don't plan to try it, I'm more limited by human time than CPU time. Thanks for the advice though! Chris K 
20101008, 16:20  #389 
Sep 2009
2·3·331 Posts 
A result from my other system doing SNFS:
sigma(15428908531^16) r1=14626378603026637440876935345110752326808617649740543443295899 (pp62) r2=348735520870862164578134010988731594775521012539225570516087953133011785002062963 (pp81) And two more ECM results: Code:
sigma(141785047417170330875956138182105901767368657881^10) ********** Factor found in step 1: 8349872936935826450829882263387 Found probable prime factor of 31 digits: 8349872936935826450829882263387 Composite cofactor 40866985545846521048453193355520513526503240765554925877353723400485544483604953923826252458151948382470863922759727058989786327240642768290326542226332321865881692141018216421787423442300724000665825199595659330779350921450136560086140658305570640678959955814433678115192087305648210585291332471320245185635679498732804767101607334727832647486861621247079329135407136244608771259695022713694923620212185008598968345925618935356337653 has 434 digits sigma(1631164874282493956886307^22) ********** Factor found in step 2: 169857056796434447746180363 Found probable prime factor of 27 digits: 169857056796434447746180363 Composite cofactor 1320467393510333024063211346076966466841344987176326750859641480884859799715831190718922798242061399416850605702085108236324986714042557397410124477729323138456022508589978108810244870449688608291500588432566165553552080036035942805450939317070299207327690658843986018600930517027023290324882482769797573657266419012869498740082495472091303138026148957934947790768632964871414242387818077191548080621282553735011441988430478473037832933580692517198691579992539673491431 has 469 digits 
20101012, 04:43  #390  
Feb 2003
2·3·29 Posts 
Quote:


20101014, 17:23  #391 
Sep 2009
2×3×331 Posts 
One more result:
sigma(18041^42): r1=846126399222253639420487670576156969521047338120896029474041329110013 (pp69) r2=135426587507029610408100819035371891457760142878407814770672813795782498399 (pp75) No more ECM results, I've finished 1 curve at 3E6 against everything in t1200.txt. How much p1, p+1 and ECM have been run against them, I'm wondering if p1 or p+1 would be more cost effective than ECM? Chris K 
20101017, 21:59  #392 
"William"
May 2003
New Haven
2^{3}×5×59 Posts 
ECM towards p50 by yoyo@home found this p49, saving the NFS factorization
Code:
sigma(3221,58) = P49 * P104 P49: 4187411465746443851965730786432472142030602773179 P104: 11578859994289585962788903706727722276478611473383633819079738873056500991287941273954277589513036337893 
20101018, 21:23  #393 
Sep 2009
1986_{10} Posts 
Another result:
sigma(217081^30): r1=132883127965541779603133141099647960961486176894560469 (pp54) r2=5317613337469178892564229124327778444553412665772353373089326643138525852814621227771 (pp85) I would have posted it earlier, but mersenneforum.org locked up on me. Chris K 
20101019, 16:57  #394 
Sep 2009
2·3·331 Posts 
And another:
sigma(926659^28) r1=7892247161280771044859798190887909435039422985794643101 (pp55) r2=36096359295529807517688919847790933188120139266525047350948270612809255451089225056386069689 (pp92) Chris K 
20101022, 16:55  #395 
Sep 2009
2×3×331 Posts 
One more:
sigma(30941^40): r1=71241324717871904734237072306645377856814262516307521318979646514277 (pp68) r2=446507703883500494604423145413264927598208355225624679133946196988827605251701927 (pp81) Chris K 
20101024, 16:04  #396 
"William"
May 2003
New Haven
2^{3}·5·59 Posts 
From Pascal's t600.txt, sigma(571^72) = P50 * P57 * P90
ECM to t50 by yoyo@home SNFS sieving by RSALS Post Processing by Lionel Debroux Code:
sigma(571^72) = P50 * P57 * P90 P50: 26386891018759314236196466940037349919451259404889 P57: 591872886509135249796335715865365136847433393908176875571 P90: 657774081749910492615766542057725047742640115655851832517033424113696223608856837236143399 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Odd perfect related road blocks  jchein1  Factoring  31  20090429 15:18 
Odd perfect related number  ZetaFlux  Factoring  46  20090424 22:03 
Question about triming [code] blocks  schickel  Forum Feedback  4  20090401 03:27 
MonoDevelop vs. Code::Blocks  ixfd64  Software  1  20080310 08:30 
Intels Intresting Road  moo  Hardware  7  20051213 02:20 