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Old 2008-11-14, 04:55   #463
gd_barnes
 
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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
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Old 2008-11-15, 02:15   #464
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Quote:
Originally Posted by gd_barnes View Post
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
File Type: zip lresults.zip (35.8 KB, 102 views)
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Old 2008-11-15, 12:54   #465
henryzz
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i am finally up to n=25k
i have found 2 more primes:
1531556 23098
1323828 23413
there are now 6 sequences left
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Old 2008-11-19, 13:37   #466
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115*26^n-1 has been tested to n=250000. No primes. I'm giving up on this one.
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Old 2008-11-20, 04:49   #467
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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
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Old 2008-11-20, 14:29   #468
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Quote:
Originally Posted by KEP View Post
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
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Old 2008-11-26, 07:12   #469
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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
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Old 2008-11-26, 18:39   #470
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398*27^n+1 completed to 400,000. No primes. I'm giving up.
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Old 2008-11-26, 19:03   #471
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Quote:
Originally Posted by rogue View Post
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
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Old 2008-11-26, 21:39   #472
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Quote:
Originally Posted by gd_barnes View Post
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.
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Old 2008-11-30, 15:22   #473
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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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