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Old 2009-01-20, 21:45   #30
I quite division it
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Feb 2005

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Originally Posted by gd_barnes View Post
1403*2^359146-1 is confirmed prime
1609*2^359209-1 is prime

I think k=1700-2000 is a nearly barren range! For n=350K to the current processing limit, we have:

23 total primes for k=1400-1700

3 total primes for k=1700-2000

This includes confirmed primes so is not biased by previous searching in any way.

As Chris is fond of me saying: Primes are very strange!

There's very strange and then there's really weird.
This sort of thing used to drive me nuts when I would do (semi)fixed n tests. Five primes for one n, then none for the next etc.

Last fiddled with by Flatlander on 2009-01-20 at 21:46
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