Seriously disagreement
Max Alekseyev
maxale at gmail.com
Tue Sep 2 23:44:45 CEST 2008
On Tue, Sep 2, 2008 at 11:58 AM, Artur <grafix at csl.pl> wrote:
> On www page
> http://www.devalco.de/quadr_Sieb_2x%5E2-1.htm
> we can read that number of primes of the form 2x^2-1 for x equal or less
> than 10^n is
> 8, 84, 815, 7922, 77250, 759077, 7492588, 74198995, 736401956,
> 7319543971, 72834161467
This page simply lists this numbers but it does NOT say that they give
"number of primes of the form 2x^2-1 for x equal or less than 10^n".
Where did you get this definition?
> %N A143835 a(n) = Number of n less or equal 10^n such than 2n^2-1 is prime
That does not make sense since n is always less than 10^n.
Max
More information about the SeqFan
mailing list