RE: Mersenne: Proth observations

[Hoogendoorn, Sander]

Andy Hedges wrote:
 
> Anyone have any idea why for k = 659 there are very little primes? In
> fact for k up to 200000 there are none (I haven't found any in this
> range yet!).

This number has bees searched till at least 270000
Take a look at http://www.prothsearch.net/rieselsearch.html
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