mersenneforum.org > Data The somewhat less mysterious exponent 11947847
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 2003-10-11, 07:16 #1 GP2     Sep 2003 3·863 Posts The somewhat less mysterious exponent 11947847 DoubleCheck=11947847,64,0 This exponent has been tested 3 times by the same machine, presumably with a different result each time. Interestingly the machine in question happens to belong to curtisc. And this is not an error-prone machine (0 bad results, 8 good results).
 2003-10-15, 07:37 #2 markr     "Mark" Feb 2003 Sydney 3·191 Posts I think I should do this one. I put it in a worktodo to see how long it would take, and now I see it has done the p-1 stuff. (No factor, unfortunately). It'll keep my DC/LL ratio up too. Maybe about a week to finish.
 2003-10-21, 23:30 #3 markr     "Mark" Feb 2003 Sydney 3·191 Posts Code: Sending result to server for exponent 11947847 ERROR 3: Exponent not assigned to this computer. Sending text message to server: UID: Rameau/mr, M11947847 is not prime. Res64: BC9E0F1356D0C8CB. WZ1: 9FEF93DB,10236226,00000000
 2003-10-24, 20:27 #4 GP2     Sep 2003 3·863 Posts A footnote: The data files now look like this: Good results: 11947847,curtisc,ccc61,WV1,BC9E0F1356D0C8CB,2046475,00010000 11947847,curtisc,ccc61,WV1,BC9E0F1356D0C8CB,2046475,00000000 11947847,curtisc,ccc61,WV1,BC9E0F1356D0C8CB,2046475,00000001 11947847,Rameau,mr,WZ1,BC9E0F1356D0C8CB,10236226,00000000 Bad results: None. So the 3 results by curtisc/ccc61 actually all had the same residue. They had the same shift count, which usually means the same test was reported more than once; however, the error codes are all different, which seems to indicate that this machine really ran the test 3 separate times with the same shift count. Perhaps a file backup was done when the first test was partially complete, and system restores were done twice later, causing the same test to resume from the same partially-completed backup point?
 2003-10-26, 22:46 #5 markr     "Mark" Feb 2003 Sydney 3×191 Posts Thanks, GP2. Good results are good news - much better than finding out there'll be a wait until a triple-check!
 2004-08-12, 00:34 #6 Mersenne-ary     Aug 2004 2·5 Posts Shouldn't this go to Completed Missions?

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