[seqfan] Re: Upper bound for A091895 and A091896

Neil Sloane njasloane at gmail.com
Sun Apr 3 07:43:33 CEST 2022

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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