20210801, 16:02  #958 
Sep 2011
Germany
11·271 Posts 
5608*70^429979+1 found by Sputnik (793358 digits)
9231*70^515544+1 found by grcpool.com3 (951234 digits) 
20210802, 03:38  #959 
"99(4^34019)99 palind"
Nov 2016
(P^81993)SZ base 36
2^{2}·3^{2}·5·17 Posts 
Nice!!! Now S70 become a 1k base, and it is now the 1k Sierp base with 2nd largest CK (the 1st largest CK is S430), and if proven (I think that both this base and S430 can be proven when tested to n=1M), it will be the proven (Sierp and Riesel) base (other than the LiskovetsGallot conjecture, i.e. Sierp base 2 even n) with largest CK
Last fiddled with by sweety439 on 20210802 at 03:55 
20210804, 14:40  #960 
Sep 2011
Germany
11×271 Posts 
166*972^1625711 found by Doug (485711 digits)
9216*421^191802+1 found by whizbang (503347 digits) 14296*421^216090+1 found by KySU (567086 digits) 24838*421^224768+1 found by KySU (589860 digits) 26362*421^244658+1 found by JohnMD (642057 digits) 26040*421^251428+1 found by KySU (659823 digits) Last fiddled with by rebirther on 20210804 at 15:08 Reason: +S421 
20210807, 06:08  #961 
Sep 2011
Germany
11×271 Posts 
6070*466^273937+1 found by CharityEngine1 (730974 digits)

20210814, 19:56  #962 
May 2007
Kansas; USA
17·619 Posts 
736663*2^17944191 is prime

20210814, 22:02  #963 
"Mark"
Apr 2003
Between here and the
6434_{10} Posts 

20210815, 05:11  #964 
May 2007
Kansas; USA
10523_{10} Posts 
Sierpinski base 1030

20210815, 09:14  #965 
Dec 2011
After milion nines:)
1,483 Posts 
How can prime be1 and Sierpinski? Mean Riesel?

20210815, 09:19  #966 
May 2007
Kansas; USA
17·619 Posts 
Oops. Riesel base 1030.

20210815, 11:04  #967 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
31·191 Posts 
Also how base 1030 when it looks like base 2?

20210815, 13:39  #968 
Mar 2006
Germany
3^{2}×5^{2}×13 Posts 
It's the 2nd Riesel Problem.

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