20070119, 19:06  #12 
Jan 2005
479 Posts 
small succes:
91268055041  22^134217728+1 So at least THAT one isn't prime :) 
20070120, 00:43  #13 
May 2003
3·7·11 Posts 

20070120, 03:23  #14 
"Jason Goatcher"
Mar 2005
110110110001_{2} Posts 

20070120, 08:03  #15 
Jan 2005
479 Posts 

20070120, 08:20  #16  
Jun 2003
3^{2}·5^{2}·7 Posts 
Quote:
Anyway why are you trying to factorize these numbers For base 22, numbers that are multiple of 22 do not have to be tested, this eliminates k=22,484 but k=1 is left. But 1*22^1+1 is prime hence 1 is eliminated. under base=100 only the following bases are left for which k does not produce a prime 38 50 62 68 86 92 98 You can try to find a prime for them Last fiddled with by Citrix on 20070120 at 08:45 

20070120, 18:29  #17  
Jan 2005
479 Posts 
Quote:
Quote:
I think this justifies the search 

20070120, 23:24  #18 
Jan 2005
479 Posts 

20070121, 02:34  #19 
Jun 2003
3^{2}×5^{2}×7 Posts 
Finding the factor should take less than 1 sec. Try to factor 1 number at a time. What numbers are left, I can try to prove them composite them for you.

20070121, 09:58  #20 
Jan 2005
111011111_{2} Posts 
Hmm... what am I doing wrong then?
srsieve is sieving about 2030Million p's per second, but not a huge amount more when sieving only 1 n. Or is srsieve the wrong program here? 
20070121, 11:11  #21 
Jun 2003
3^{2}×5^{2}×7 Posts 

20070121, 12:54  #22 
Jan 2005
479 Posts 

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