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Old 2020-11-18, 15:23   #11
Dr Sardonicus
 
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Feb 2017
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Quote:
Originally Posted by paulunderwood View Post
I found this counterexample for a=4: n=68368998319.
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...


Quote:
a even means gcd(D,E)>1.
Yes, if "a" is even, gcd(D,E) is 4.
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