If you used your elderly computer to search for known results rather
than for computations you would have discovered
and, in particular,
the entry 264239
264239 = 139 * 1901
264238 = 2 * 13 * 10163
On Mon, 2010-02-01 at 06:18 -0800, Bill Bouris wrote:
> I believe that if 'N' passes the 2-PRP test that either 3, 5, or 7
> divides 'N-1', one or
> all of them, or 'N' will be divisible by 3, 5, or 7 and be composite.
> I could only go
> so far with my outdated computer and UBasic. Can anyone find a
> counter-example ???