20210801, 16:02  #958 
Sep 2011
Germany
3,023 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}×19×41 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
3,023 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
3023_{10} Posts 
6070*466^273937+1 found by CharityEngine1 (730974 digits)

20210814, 19:56  #962 
May 2007
Kansas; USA
3^{3}×17×23 Posts 
736663*2^17944191 is prime

20210814, 22:02  #963 
"Mark"
Apr 2003
Between here and the
2×5×647 Posts 

20210815, 05:11  #964 
May 2007
Kansas; USA
3^{3}·17·23 Posts 
Sierpinski base 1030

20210815, 09:14  #965 
Dec 2011
After milion nines:)
1,487 Posts 
How can prime be1 and Sierpinski? Mean Riesel?

20210815, 09:19  #966 
May 2007
Kansas; USA
3^{3}×17×23 Posts 
Oops. Riesel base 1030.

20210815, 11:04  #967 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
5,939 Posts 
Also how base 1030 when it looks like base 2?

20210815, 13:39  #968 
Mar 2006
Germany
2^{4}×3×61 Posts 
It's the 2nd Riesel Problem.

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Report top5000 primes for all k<=1001  gd_barnes  No Prime Left Behind  1532  20211204 02:36 
Report top5000 primes for k=10033000  gd_barnes  No Prime Left Behind  688  20200424 07:31 
All top 5000 primes will have the same number of digits in 2014 ;)  Batalov  Conjectures 'R Us  10  20130329 01:29 
Twenty Oldest Primes on Top 5000 List  masser  Lounge  9  20080827 12:31 
get all the 5000 biggest primes above 100K digits  jasong  jasong  1  20070609 22:51 