[seqfan] Re: A128471

[zak seidov]

1) Leave just 
%N Numbers of the form 30k+7

2) omit "silly" %C

or better
3) don't spare profi's precious time 
for such a "less" SEQ.

--- On Sun, 9/5/10, Robert Israel <israel at math.ubc.ca> wrote:

> From: Robert Israel <israel at math.ubc.ca>
> Subject: [seqfan] Re: A128471
> To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
> Date: Sunday, September 5, 2010, 4:16 AM
> You could just as well say a(n) =
> a(n-1)+30, with a(1)=7.
> But I think the "or with the exception of the first entry,
> numbers that 
> cannot be part of a twin prime pair" should not be part of
> the title.
> Maybe at most a comment, though even this is rather silly:
> there are
> lots of numbers not in the sequence that also can't be part
> of a twin
> prime pair.
> 
> Robert Israel           
>                
>     israel at math.ubc.ca
> Department of Mathematics        http://www.math.ubc.ca/~israel 
> University of British Columbia       
>     Vancouver, BC, Canada
> 
> 
> On Sat, 4 Sep 2010, vincenzo.librandi at tin.it
> wrote:
> 
> > Dear seqfqns
> > formula of A128471:
> > a(n)=2*a(n-1)-a(n-2), with (a(1)=7 a(2)=37)
> > Ex: a(3)=2*37-7=67; a(4)=2*67-37=97;
> a(5)=2*97-67=127.
> > Regards, Vincenzo
> >