[seqfan] Re: put the numbers from 1 to n such the sum of two of them are prime

zak seidov zakseidov at yahoo.com
Mon Mar 14 17:08:23 CET 2011


Another case may be of interest
when the "first" and the "last" terms are also sum up to prime (circle of pairwise primes?).
Zak

--- On Mon, 3/14/11, N. J. A. Sloane <njas at research.att.com> wrote:

> From: N. J. A. Sloane <njas at research.att.com>
> Subject: [seqfan] Re: put the numbers from 1 to n such the sum of two of them are prime
> To: seqfan at list.seqfan.eu
> Cc: njas at research.att.com
> Date: Monday, March 14, 2011, 11:28 AM
> Franklin pointed out that one version
> of
> the sequence is already in the OEIS (A051237 and A187869).
> 
> But the problem as stated by Claudio Meller seems not to
> be.
> I entered a new sequence, A187871, which gives the
> beginning
> of the sequence. Could someone extend it? And also enter
> the triangle
> that is analogous to A051237.
> 
> The difference lies in whether the n-th number has to end
> with
> "n", as in A051237 and A187869, or not (as in A187871).
> 
> Neil
> 
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