[seqfan] Re: A004143 From the powers that be
Neil Sloane
njasloane at gmail.com
Mon Dec 21 20:03:16 CET 2015
Sean, you could ask Roger E., the first author,
Email roger.eggleton at newcastle.edu.au
(The other two authors would be harder to reach)
If the published values do turn out to be wrong, best thing is to create a
new sequence for the *bad *values, with name "Erroneous version of A004143"
, giving the Monthly reference,
and then correcting the old version
Please let me know what you find out
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 Mon, Dec 21, 2015 at 1:48 PM, Sean A. Irvine <sairvin at gmail.com> wrote:
> I have been trying to reproduce A004143. Since it is the festive season,
> perhaps looking at this sequence titled "From the powers that be" is
> appropriate :-)
>
> I think the offset for this sequence is wrong, the first term should be
> a(1)=0, rather than a(2)=0. The sequence of values that I get is,
>
> 0, 1, 2, 5, 10, 40, 40, 105, 5627, 14501, 330861, 658110, 897229.
>
> This differs from the existing values in that I have a(8) = 105 rather than
> the 106 given in the OEIS and in Eggleton et al. paper. My chain of powers
> for this case runs:
>
> 2^105 > 3^66 > 5^45 > 7^37 > 11^30 > 13^28 > 17^25 > 19^24,
>
> with each power satisfying p_i^{m_i} <= 2^105 < p_i^{m_i+1}.
>
> Since this is an old sequence, I would quite like an independent
> verification of this before modifying the entry.
>
> Regards,
> Sean.
>
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