[seqfan] Re: Upper bound for A091895 and A091896
michel.marcus183 at gmail.com
Sun Apr 3 08:44:53 CEST 2022
Maybe use d(n) <= 2 sqrt(n) [see Mitrinovich, p. 39, also A046522].
Le dim. 3 avr. 2022 à 07:43, Neil Sloane <njasloane at gmail.com> a écrit :
> What about sequence A091896? These are supposed to be the n for which no k
> exists, and there is a program.
> Which seems to use the bound 25000000. So is this just a guess? Would
> this be called a "program based on a conjecture"?
> Or is there some mathematics behind it? Bob?
> Is there a proof that 18 is in A091896?
> Best regards
> Neil J. A. Sloane, Chairman, OEIS Foundation.
> Also Visiting Scientist, Math. Dept., Rutgers University,
> Email: njasloane at gmail.com
> On Sun, Apr 3, 2022 at 12:44 AM Michel Marcus <michel.marcus183 at gmail.com>
> > Dear Seqfans,
> > What would be a good upper bound when looking for terms of A091895 and
> > A091896 ?
> > Thanks.
> > MM
> > --
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