20140805, 15:41  #12  
Oct 2007
3^{2}·11 Posts 
Quote:
By the way.. this thread is called "51*2^37741291 is not prime", so unless it gets renamed it is not about other numbers. 

20140805, 17:09  #13 
"Serge"
Mar 2008
Phi(3,3^1118781+1)/3
10001100111101_{2} Posts 
Persistence is the key to success. Congratulations, Peter!

20140805, 17:47  #14 
Oct 2007
99_{10} Posts 
That's true, I was at k=51 since 2010, thank you.
By the way.. n=2.5M to 3.7M was single checked, n=3.7M up to the prime double checked. If anyone is interested.. in the latter range there were > 35000 candidates and 17 third checks because of differing residues (hardware errors). 
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