20081115, 02:15  #496 
Sep 2005
Raleigh, North Carolina
337 Posts 
Here they are.

20081115, 12:54  #497 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
3^{4}×71 Posts 
i am finally up to n=25k
i have found 2 more primes: 1531556 23098 1323828 23413 there are now 6 sequences left 
20081119, 13:37  #498 
"Mark"
Apr 2003
Between here and the
2^{2}×5×7×43 Posts 
115*26^n1 has been tested to n=250000. No primes. I'm giving up on this one.

20081120, 04:49  #499 
Quasi Admin Thing
May 2005
2^{4}·59 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 KEP Last fiddled with by gd_barnes on 20081120 at 14:28 Reason: Put primes in code 
20081120, 14:29  #500  
May 2007
Kansas; USA
10244_{10} Posts 
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! Gary Last fiddled with by gd_barnes on 20081120 at 14:30 

20081126, 07:12  #501 
May 2007
Kansas; USA
24004_{8} Posts 
Sierp base 12 now at n=210K.
Nothing new to report; continuing on... Last fiddled with by gd_barnes on 20100511 at 05:01 Reason: remove base > 32 
20081126, 18:39  #502 
"Mark"
Apr 2003
Between here and the
2^{2}×5×7×43 Posts 
398*27^n+1 completed to 400,000. No primes. I'm giving up.

20081126, 19:03  #503 
May 2007
Kansas; USA
2^{2}×13×197 Posts 

20081126, 21:39  #504 
"Mark"
Apr 2003
Between here and the
2^{2}×5×7×43 Posts 

20081130, 15:22  #505 
Jan 2006
Hungary
10C_{16} 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 20100516 at 08:51 Reason: remove bases > 32 
20081202, 22:39  #506 
Jan 2005
479 Posts 
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... 
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