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 2008-11-14, 04:55 #463 gd_barnes     May 2007 Kansas; USA 5×2,311 Posts Sierp base 12 is finally at n=200K...nothing to report; continuing on to n=250K. Thanks to Max for speedy Phrot! My tests are ~40% faster: 3480 vs. 2090 secs. per test at n=195K!! Gary Last fiddled with by gd_barnes on 2008-11-14 at 04:57
2008-11-15, 02:15   #464
grobie

Sep 2005
Raleigh, North Carolina

337 Posts

Quote:
 Originally Posted by gd_barnes Yes, if you could post the results file or Email it to be at: gbarnes017 at gmail dot com ; that would be great. Gary
Here they are.
Attached Files
 lresults.zip (35.8 KB, 102 views)

 2008-11-15, 12:54 #465 henryzz Just call me Henry     "David" Sep 2007 Liverpool (GMT/BST) 7·859 Posts i am finally up to n=25k i have found 2 more primes: 1531556 23098 1323828 23413 there are now 6 sequences left
 2008-11-19, 13:37 #466 rogue     "Mark" Apr 2003 Between here and the 2·3,413 Posts 115*26^n-1 has been tested to n=250000. No primes. I'm giving up on this one.
 2008-11-20, 04:49 #467 KEP Quasi Admin Thing     May 2005 11110100112 Posts Sierp base 19 is complete to n=25K. Following 80 primes remains to be removed: Code: 637294*19^20627+1 238444*19^20629+1 517116*19^20650+1 607674*19^20703+1 21634*19^20721+1 665074*19^20757+1 150184*19^20803+1 747784*19^20835+1 415314*19^20837+1 36814*19^20857+1 451284*19^20951+1 309114*19^20987+1 200616*19^21014+1 153936*19^21134+1 561846*19^21154+1 506106*19^21292+1 417436*19^21322+1 590044*19^21355+1 627804*19^21469+1 236346*19^21502+1 240304*19^21527+1 245914*19^21537+1 759196*19^21550+1 509746*19^21584+1 619306*19^21604+1 249664*19^21615+1 20646*19^21678+1 728446*19^21810+1 87826*19^21904+1 42766*19^21920+1 15874*19^22001+1 173136*19^22038+1 437776*19^22052+1 23014*19^22087+1 276714*19^22095+1 751434*19^22183+1 270156*19^22284+1 232264*19^22413+1 556194*19^22461+1 440784*19^22477+1 181326*19^22524+1 732016*19^22552+1 241234*19^22629+1 44056*19^22714+1 314206*19^22786+1 76644*19^22855+1 356586*19^22858+1 450594*19^22911+1 83154*19^22975+1 20556*19^22988+1 562176*19^23078+1 217786*19^23110+1 621316*19^23172+1 438534*19^23201+1 134686*19^23246+1 732226*19^23302+1 71034*19^23343+1 548676*19^23362+1 252436*19^23432+1 437574*19^23511+1 585196*19^23534+1 349366*19^23630+1 171406*19^23662+1 64044*19^23879+1 394176*19^23954+1 295554*19^23961+1 539664*19^23973+1 308656*19^24120+1 575676*19^24132+1 53974*19^24197+1 337146*19^24268+1 185656*19^24332+1 205294*19^24381+1 428466*19^24392+1 717004*19^24643+1 610564*19^24747+1 62044*19^24815+1 559066*19^24980+1 262456*19^24988+1 423064*19^24989+1 Regards KEP Last fiddled with by gd_barnes on 2008-11-20 at 14:28 Reason: Put primes in code
2008-11-20, 14:29   #468
gd_barnes

May 2007
Kansas; USA

101101001000112 Posts

Quote:
 Originally Posted by KEP Sierp base 19 is complete to n=25K. Following 80 primes remains to be removed: Regards KEP

Thanks for a nice effort on Sierp base 19 Kenneth. It's a very composite base so it will keep us entertained for many years!

Gary

Last fiddled with by gd_barnes on 2008-11-20 at 14:30

 2008-11-26, 07:12 #469 gd_barnes     May 2007 Kansas; USA 5×2,311 Posts Sierp base 12 now at n=210K. Nothing new to report; continuing on... Last fiddled with by gd_barnes on 2010-05-11 at 05:01 Reason: remove base > 32
 2008-11-26, 18:39 #470 rogue     "Mark" Apr 2003 Between here and the 1AAA16 Posts 398*27^n+1 completed to 400,000. No primes. I'm giving up.
2008-11-26, 19:03   #471
gd_barnes

May 2007
Kansas; USA

5·2,311 Posts

Quote:
 Originally Posted by rogue 398*27^n+1 completed to 400,000. No primes. I'm giving up.

Wow. Tough bases! Thanks for the huge amount of work!

Do you have results files that you could post for this one and your recently completed base 26 effort here?

Thanks,
Gary

2008-11-26, 21:39   #472
rogue

"Mark"
Apr 2003
Between here and the

11010101010102 Posts

Quote:
 Originally Posted by gd_barnes Wow. Tough bases! Thanks for the huge amount of work! Do you have results files that you could post for this one and your recently completed base 26 effort here? Thanks, Gary
No. I had really expected them to fall long before I got as far as I did.

 2008-11-30, 15:22 #473 Siemelink     Jan 2006 Hungary 26810 Posts Riesel update Hi Gary, I am comparing my results with your excellent pages. Here is the difference: Riesel base 7: I searched until n = 108,000, sieved until n = 200,000. Cheers, Willem. Last fiddled with by gd_barnes on 2010-05-16 at 08:51 Reason: remove bases > 32

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