Quote:
Originally Posted by paulunderwood
I found this counterexample for a=4: n=68368998319.
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I checked this example, just to see if anything interesting was going on.
Code:
? factor(68368998319)
%1 =
[106747 1]
[640477 1]
? for(i=1,#%1[,1],print(factor(%1[i,1]-1)))
[2, 1; 3, 1; 17791, 1]
[2, 2; 3, 2; 17791, 1]
Gee, that's funny...
Yes, if "a" is even, gcd(D,E) is 4.