[seqfan] Re: Mystery of A049476

[Neil Sloane]

Sean,  I have quite a lot of information about the paper F. W. Roush and D.
G. Rogers, A prime algorithm?, preprint, 1999. I did have a copy at one
point, but it is not in my folder of Rogers's papers.

My first suggestion would be to make a triangle out of Zumkeller's b-file
for A088643, and see if the terms of A049476 somehow match the rows - or
pick out rows with some special feature.  (I assume you did that, but did
you remember that "gap" can mean different things to different people? The
gap between 7 and 9 can be 1 or 2, depending on your definition.

I have lost track of D G Rogers, who never seemed to have a really
permanent address.
But his coauthor Fred. W. Roush might be easier to track down.  Maybe he
still has a copy??

I have a lot more info about the paper in question, but I cannot put it on
record here.

Best regards
Neil

Neil J. A. Sloane, Chairman, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com



On Sun, Aug 1, 2021 at 5:14 PM Sean A. Irvine <sairvin at gmail.com> wrote:

> Can anyone understand what is going on in A049476 and A049478 ?
>
> I have tried a couple of interpretations, but have been unable to make
> these work. For A049476, I get quite close by looking at the largest
> difference between any pair of adjacent elements in each row of A088643.
>
> Also, A049477 looks like it should be A049478(n)-A049476(n) (and indeed it
> used to be defined that way). The current name seems to refer to completely
> unrelated sequences. This problem will be easy to correct, but it would be
> nice to have a clearer explanation of A049476 first.
>
> https://oeis.org/A049476
> https://oeis.org/A049477
> https://oeis.org/A049478
> https://oeis.org/A088643
>
> Sean.
>
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