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Old 2014-06-30, 08:30   #1574
pb386
 
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Nov 2003

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1261*2^1753021-1 (527716 digits)
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Old 2014-06-30, 18:44   #1575
amphoria
 
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4001*2^2093286-1 (630146 digits)

This is only the second known prime for this k. The other is for n=18.
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Old 2014-07-01, 04:34   #1576
Kosmaj
 
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169*2^1590665-1 (478841 digits)

amphoria, nice prime!
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Old 2014-07-02, 18:39   #1577
pb386
 
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1391*2^1754922-1 (528288 digits)
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Old 2014-07-03, 09:38   #1578
pinhodecarlos
 
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"Carlos Pinho"
Oct 2011
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175*2^1711779-1 is prime! (515300 decimal digits) Time : 2823.373 sec.
(Second Megabit Drive)
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Old 2014-07-04, 04:04   #1579
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

100011011101102 Posts
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125·22037752-1 (613427 digits)
105·22280078-1 (686374 digits)

Last fiddled with by Batalov on 2014-07-05 at 00:57
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Old 2014-07-05, 19:47   #1580
amphoria
 
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4117*2^1807085-1 (543991 digits)
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Old 2014-07-06, 15:31   #1581
Batalov
 
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Phi(4,2^7658614+1)/2

2×3×17×89 Posts
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275·21846390-1 (555822 digits)
295·21832129-1 (551529 digits)
235·21824515-1 (549237 digits)
(Third Megabit Drive)
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Old 2014-07-07, 19:11   #1582
amphoria
 
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4015*2^1875453-1 (564572 digits)
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Old 2014-07-08, 08:01   #1583
pb386
 
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1037*2^1760216-1 (529881 digits)
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Old 2014-07-08, 15:28   #1584
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1253*2^1760738-1 (530039 digits)
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