20110425, 23:42  #45  
"Lennart"
Jun 2007
2^{5}·5·7 Posts 
Quote:
173943*2^480166+1 is not prime. Proth RES64: 08559155C6E8CABD Time : 371.504 sec. 179025*2^480578+1 is not prime. Proth RES64: 1F4BCFCFE5B43B85 Time : 370.618 sec. 115095*2^480748+1 is not prime. Proth RES64: 0A925998113E43DB Time : 307.396 sec. 112983*2^480882+1 is not prime. Proth RES64: 90E8491411FE7161 Time : 308.301 sec. 146649*2^480989+1 is not prime. Proth RES64: 7408B6508FC388FE Time : 371.729 sec. 182379*2^481201+1 is not prime. Proth RES64: FB973052CB71AFAC Time : 371.908 sec. 158655*2^481257+1 is not prime. Proth RES64: 7DC37505FCBBD669 Time : 371.069 sec. 101085*2^483510+1 is not prime. Proth RES64: 6C1364E77C24175C Time : 310.906 sec. 117711*2^483635+1 is not prime. Proth RES64: 0FFED8CAE0BD7500 Time : 310.842 sec. 103077*2^483810+1 is not prime. Proth RES64: BA7164860CCC5DF5 Time : 312.482 sec. 182523*2^483936+1 is not prime. Proth RES64: 047FF2FC723D0874 Time : 374.465 sec. Lennart 

20110426, 20:00  #46  
"Forget I exist"
Jul 2009
Dartmouth NS
2×3×23×61 Posts 
Quote:
all I know about this topic is k*2^n 1 only seems to be possible twin when k mod 3=0 . the bolded seems impossible once with it not prime the next with it prime. 

20110426, 20:22  #47 
Mar 2006
Germany
5667_{8} Posts 

20110430, 04:27  #48 
"Lennart"
Jun 2007
2^{5}·5·7 Posts 
178107*2^4816941 is Prime
173985*2^4818571 is Prime Lennart 
20110504, 17:03  #49 
"Lennart"
Jun 2007
2140_{8} Posts 
182505*2^4820661 is Prime
198045*2^4821291 is Prime 111573*2^4821601 is Prime 110295*2^4824051 is Prime 110439*2^4824471 is Prime 150591*2^4825271 is Prime 167877*2^4825681 is Prime 170049*2^4826891 is Prime 101055*2^4826961 is Prime 123807*2^4828081 is Prime 140925*2^4828391 is Prime Lennart 
20110901, 12:43  #50 
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
odicin found the following prime a while back while Oddball was on vacation:
user=odicin [20110807 01:07:46] 139023*2^4851741 is prime! Time : 0.0 sec. user=odicin [20110807 01:07:46] 139023*2^485174+1 is not prime. Res64: 65644C7379D517CF Time : 0.0 sec. 
20110902, 05:15  #51  
May 2010
763_{8} Posts 
Quote:


20110914, 05:51  #52 
Sep 2011
Potsdam, Germany
222_{8} Posts 
By celebratory of two new primes found (and the hundreds overeall on this server), I'm now registered here in the forum
[20110913 12:54:34] 144747*2^4853601 is prime! Time : 0.0 sec. 144747*2^485360+1 is neither PRP nor prime [20110914 00:19:41] 159159*2^4853731 is prime! Time : 0.0 sec. 159159*2^485373+1 is neither PRP nor prime Regards Odi 
20110918, 10:21  #53 
Mar 2011
Finland
19 Posts 
144183*2^4863981 is prime
 Lumiukko 
20110918, 10:53  #54 
Sep 2011
Potsdam, Germany
2·73 Posts 
[20110916 13:09]
116355*2^4854851 is prime! Time : 0.0 sec. 116355*2^485485+1 is neither PRP nor prime [20110918 03:48] 161691*2^4860911 is prime! Time : 0.0 sec. 161691*2^486091+1 is neither PRP nor prime [20110918 05:04] 149085*2^4861611 is prime! Time : 0.0 sec. 149085*2^486161+1 is neither PRP nor prime [20110918 07:34] 134949*2^4863091 is prime! Time : 0.0 sec. 134949*2^486309+1 is neither PRP nor prime Odi 
20110918, 16:01  #55 
"Lennart"
Jun 2007
2^{5}×5×7 Posts 
113175*2^4860671
138891*2^4860951 180411*2^4861591 150849*2^4865871 179085*2^4867981 155145*2^4868581 Is Prime :) 
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