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Old 2006-04-08, 23:25   #3
R.D. Silverman
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Nov 2003

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Originally Posted by wblipp
IIRC, Bob Silverman was working a list of an ± bn.

For numbers close to this form with known interest in the factors, Richard Brent will take factors of a337-1, with a < 10,000 and the factors > 109.

At present he lists factors for only a from 2 to 10 and a=337.
I have done all 4^n - 3^n for n <= 261

I have done some recent work on extending 3^n +/- 2^n to n = 400.
There are about 2 dozen composites left.
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