A129755 (??!!)
zak seidov
zakseidov at yahoo.com
Thu May 31 05:28:15 CEST 2007
Dear seqfans,
Please anybody explain me (and Neil)
what's wrong with this SEQ?
My explanations were simply ignored by Neil.
Thanks, Zak
%I A129755
%S A129755
1,3,21,91,153,171,231,253,561,741,1081,1653,1711,1891,2211,2701,3321,
%T A129755
3403,4851,6441,8001,9453,9591,10153,12403,15051,16471,17391,18721,
%U A129755
23653,24753,27261,30381,32131,35511,38781,39621,41041,44253,45753
%N A129755 Triangular numbers t such that t+10 is a
prime.
%K A129755 nonn,new,uned,obsc,less
%O A129755 1,2
%A A129755 Zak Seidov (zakseidov(AT)yahoo.com), May 15
2007
%E A129755 I received several confusing emails about
this sequence. It should be rechecked. - njas, May 29
2007
Wed, 30 May 2007 14:24:48 -0400 (EDT)
From: "N. J. A. Sloane" <njas at research.att.com>
To: "zak seidov" <zakseidov at yahoo.com>
Subject: Re: re A129755
Zak, I did not understand what you said.
Is the entry correct?
Neil
Wed, 30 May 2007 10:07:04 -0700 (PDT)
From: "zak seidov" <zakseidov at yahoo.com>
Subject: Re: re A129755
To: njas at research.att.com
Dear Neil,
You didn't receive this my explanation,
or you don't agree with it,
that you labeled A129755
with all possible "bad" tags:
%K A129755 uned,obsc,less ?!
Thanks, Zak
%I A129755
%S A129755
1,3,21,91,153,171,231,253,561,741,1081,1653,1711,1891,2211,2701,3321,
%T A129755
3403,4851,6441,8001,9453,9591,10153,12403,15051,16471,17391,18721,
%U A129755
23653,24753,27261,30381,32131,35511,38781,39621,41041,44253,45753
%N A129755 Triangular numbers t such that t+10 is a
prime.
%K A129755 nonn,new,uned,obsc,less
%O A129755 1,2
%A A129755 Zak Seidov (zakseidov(AT)yahoo.com), May 15
2007
%E A129755 I received several confusing emails about
this sequence. It should be rechecked. - njas, May 29
2007
--- zak seidov <zakseidov at yahoo.com> wrote:
> Neil:
> T(n)-10=(n+5)(n-4)/2 which is prime only for n=5,6,
> that is T(5)=15 and T(6)=21, right?
> Zak
>
> --- "N. J. A. Sloane" <njas at research.att.com> wrote:
>
> >
> > Zak, I did not understand the email you sent!
> >
> > Here is what I have now:
> >
> > %I A129755
> > %S A129755
> >
>
1,3,21,91,153,171,231,253,561,741,1081,1653,1711,1891,2211,2701,3321,
> > %T A129755
> >
>
3403,4851,6441,8001,9453,9591,10153,12403,15051,16471,17391,18721,
> > %U A129755
> >
>
23653,24753,27261,30381,32131,35511,38781,39621,41041,44253,45753
> > %N A129755 Triangular numbers t such that t+10 is
> a
> > prime.
> > %C A129755 The only triangular numbers t such that
> > t-10 is a (positive) prime are 15 and 21.
> > %K A129755 nonn,new
> > %O A129755 1,2
> > %A A129755 Zak Seidov (zakseidov(AT)yahoo.com),
> May
> > 15 2007
> >
> > Is that correct?
> >
> > Neil
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