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 2018-05-03, 17:51 #67 Cruelty     May 2005 2×809 Posts status report k=2 and k=4 @ base=3 tested till n=1.72M 127*128^n-1 tested till n=1.8M
 2018-09-02, 00:35 #68 Cruelty     May 2005 2·809 Posts status report k=2 and k=4 @ base=3 tested till n=1.76M 127*128^n-1 tested till n=1.86M
 2018-11-01, 12:37 #69 Cruelty     May 2005 2×809 Posts status report k=2 and k=4 @ base=3 tested till n=1.78M 127*128^n-1 tested till n=1.88M
 2018-11-30, 23:31 #70 Cruelty     May 2005 31228 Posts status report k=2 and k=4 @ base=3 tested till n=1.8M 127*128^n-1 tested till n=1.88M
 2019-01-01, 15:39 #71 Cruelty     May 2005 65216 Posts status report k=2 and k=4 @ base=3 tested till n=1.81M 127*128^n-1 tested till n=1.93M
 2019-03-01, 19:15 #72 Cruelty     May 2005 2×809 Posts status report k=2 and k=4 @ base=3 tested till n=1.84M 127*128^n-1 tested till n=1.95M
 2019-04-14, 17:28 #73 kar_bon     Mar 2006 Germany 5·569 Posts Made pages for 2*3^n-1 and 4*3^n-1 in the PrimeWiki, S.Harvey is aware of these, too. For k=4 I've not included n=0 as in the OEIS-entry.
 2019-09-05, 13:17 #74 Cruelty     May 2005 110010100102 Posts status report k=2 and k=4 @ base=3 tested till n=1.93M 127*128^n-1 tested till n=2.07M
 2019-10-05, 17:28 #75 Cruelty     May 2005 2×809 Posts status report k=2 and k=4 @ base=3 tested till n=1.94M 127*128^n-1 tested till n=2.08M
 2020-01-03, 20:42 #76 Cruelty     May 2005 161810 Posts status report k=2 and k=4 @ base=3 tested till n=2M (sieving) 127*128^n-1 tested till n=2.15M
 2020-04-04, 00:20 #77 Cruelty     May 2005 2×809 Posts status report k=2 and k=4 @ base=3 tested till n=2M (sieving) 127*128^n-1 tested till n=2.22M

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