[seqfan] Re: Subtract if prime, else add

[Neil Sloane]

Eric, A309529 and A309521 are an interesting pair of sequences!

For A309529 (I did a bit of editing), it would be interesting to see what
happens
when we look at more terms - does the sequence stay positive, or does it go
negative again at some point?

Maybe Lars could look at it?  It would be interesting to see the graphs of
the first X terms, for some
large values of X !

For the "primes" version, A309521 (again I did some editing), now that it
has been approved, we need a b-file!  Lars's comments suggest that this one
is going to keep growing for ever, unlike the first sequence.


Best regards
Neil

Neil J. A. Sloane, President, 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 Tue, Aug 6, 2019 at 6:24 AM Éric Angelini <eric.angelini at skynet.be>
wrote:

> Lars, be blessed among the blessed!
> I will submit this asap to the OEIS!
>
> à+
> É.
> Catapulté de mon aPhone
>
>
> > Le 6 août 2019 à 10:43, Lars Blomberg <larsl.blomberg at comhem.se> a
> écrit :
> >
> >
> > Up to 10^6 the terms increase approximately linearly, no cycles are
> visible.
> > The last terms are
> > 3590238, 3590240, 3590242, 3590248, 3590251, 3590251, 3590257, 3590259,
> 3590261, 3590267, 3590270, 3590279, 3590285, 3590287, 3590289, 3590295,
> 3590298, 3590306, 3590312, 3590314, 3590316, 3590322, 3590326, 3590326,
> 3590332, 3590334, 3590336, 3590342, 3590346
> >
> > Small values not encountered
> > 2, 3, 6, 7, 13, 14, 19, 20, 24, 30, 31, 32, 33, 34, 35, 37, 39, 40, 41,
> 42, 43, 44, 46, 49, 51, 53, 55, 56, 57, 58, 59, 60, 61, 66, 67, 68, 69, 70,
> 75, 76, 77, 78, 79, 80, 81, 83, 85, 86, 87, 88, 89, 90, 91, 92, 100, 108,
> 109, 110, 113, 114, 115, 116, 117, 118
> > (same as for 1000 terms)
> >
> > /Lars
> >
> >
> >
> > --
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>
>
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