79.3-79.4 to 2^65
 

I'll do some timing tests on factoring, and I could as well do some real work, so I'll take this range.

Done. 2329 exponents tested. 35 factors found.

One test from 2^64 to 2^65 took about 68 minutes on a P4 Northwood at 2.4 GHz, and about 28 minutes on one core of Core 2 Quad Q6600, also at 2.4 GHz (while the other cores were doing LL, P-1 and the tests of the Seventeen-or-bust project).