[QUOTE=gd_barnes;149243]Yes, if you could post the results file or Email it to be at: gbarnes017 at gmail dot com ; that would be great.



Gary[/QUOTE]

Here they are.

i am finally up to n=25k
i have found 2 more primes:
1531556 23098
1323828 23413
there are now 6 sequences left

115*26^n-1 has been tested to n=250000. No primes. I'm giving up on this one.

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
[/code]

Regards

KEP

[quote=KEP;149979]Sierp base 19 is complete to n=25K. Following 80 primes remains to be removed:

Regards

KEP[/quote]


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! :smile:


Gary

Sierp base 12 now at n=210K.

Nothing new to report; continuing on...

398*27^n+1 completed to 400,000. No primes. I'm giving up.

[quote=rogue;150844]398*27^n+1 completed to 400,000. No primes. I'm giving up.[/quote]


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

[QUOTE=gd_barnes;150859]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[/QUOTE]

No. I had really expected them to fall long before I got as far as I did.

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.

Riesel base 31
 

Riesel base 31 is now at 100k.

I have found no further primes :(

I'll be leaving this base alone for a while now...