[seqfan] Re: The Jacob's Ladder sequence: nice but not new

Antti Karttunen antti.karttunen at gmail.com
Thu Feb 22 11:36:53 CET 2018

I submitted this just now as A297158. If anybody wants to submit an
additional large graph-file (like Hans Havermann has done for
A065358), then please do.

Note that both here and in https://oeis.org/A065358 some of the
subsequences (at least in the beginning) between two successive zeros
are palindromic and some are not.

Best regards,


On Wed, Feb 21, 2018 at 6:05 PM, Antti Karttunen
<antti.karttunen at gmail.com> wrote:
> Regarding A065358, The Jacob's Ladder sequence.
> (ref: http://list.seqfan.eu/pipermail/seqfan/2018-February/018334.html )
> I wonder whether the random walk would look substantially different, if one used
> https://oeis.org/A192512 (Number of ludic numbers (A003309) not
> greater than n) instead of A000720 ?
> (maybe computing it as a(n) = Sum_{k=1..n} (-1)^(a(n)-1) so that the
> ladder would go towards the same direction as A065358)
> One could call that "Jacob's Ladder sequence computed for Ludic
> numbers". Or "Ludic Ladder" for short?
> For a lots of precomputed Ludic numbers, see Donovan Johnson's
> zip-file [cached copy] linked at https://oeis.org/A255420
> Best regards,
> Antti

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