[seqfan] Re: sigma(n) =

[David Wilson]

In the email, the element 710040 should be 71040.

> -----Original Message-----
> From: SeqFan [mailto:seqfan-bounces at list.seqfan.eu] On Behalf Of Olivier
> Gerard
> Sent: Friday, November 20, 2015 5:00 AM
> To: Sequence Fanatics Discussion list
> Subject: [seqfan] Re: sigma(n) =
> 
> Your messages were stalled for a long time in the mailing list queue among
> advertising messages from russian spammers.
> 
> 
> In my opinion,  the sequence 5)  sigma(n) = 2*sigma(n - 2)   is interesting
> and you should submit it.
> 
> Best Regards,
> 
> Olivier
> 
> 
> On Wed, Nov 11, 2015 at 8:07 AM, юрий герасимов <2stepan at rambler.ru>
> wrote:
> 
> > Dear SeqFans, also n such that:
> >
> > 4) sigma(n) = 1*sigma(n - 1): 15, 207, 958, ... (in OEIS is A231546)
> >
> > 5) sigma(n) = 2*sigma(n - 2): 120. 1560, 2940, 17760, 19920, 32220,
> > 33840, 55965, 710040, 186780, 308040, 511500, 523776, 553500, 699360,
> > 838215, ...
> >
> > 6) sigma(n) = 3*sigma(n - 3); 6, 30240, 242320, 3116960, 4044090,
> > 6902280, ...
> >
> > 7) sigma(n) = 4*sigma(n - 4): 6, ....
> >
> > 8) sigma(n) = 5*sigma(n - 5). ?
> >
> > юрий герасимов.
> >
> >  09.11.2015, 18:42:11 пользователь юрий герасимов
> (2stepan at rambler.ru)
> >  написал:
> >
> >
> >
> >  Dear SeqFans, n such that:
> >
> >  1) sigma(n) = sigma(n - 2) + sigma(n + 2): 5160, 19080, 210336,
> > 606420,  1146720, 2382480, 3409140, ...
> >
> >  2) sigma(n) = sigma(n - 2) - sigma(n + 2): 12812942, 45553367,
> > 95028362, ...
> >
> >  3) sigma(n) = sigma(n + 2) - sigma(n - 2): 358, 62494, 342238,
> > 410638,  8219473, 58463494, ...
> >
> >  The sequences are "of general interest"?
> >
> >  Best regards, JSG
> >
> > _______________________________________________
> >
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> >
> 
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