[seqfan] Re: A175723: Why not monotonic and why repetitions?

Miller, Shao shao.miller at yrdsb.edu.on.ca
Wed Aug 18 22:12:09 CEST 2010

-----Original Message-----
From: Richard Mathar [mailto:mathar at strw.leidenuniv.nl] 
Sent: Wednesday, August 18, 2010 14:51
To: seqfan at seqfan.eu
Cc: Miller, Shao
Subject: Re: A175723: Why not monotonic and why repetitions?


zz> %S A175723 24,36,36,48,54,66,78,90,120,144,144,168,84,96,120,132,186
zz> %N A175723 These are multiples of 6 without surrounding twin primes.
zz> %C A175723 Why not monotonic and why repetitions?

Should probably called a duplicate of A054775 unless the author
can explain where the difference might be. There is some low probability
that this was supposed to be a 2D variant, where surrounding (like in
dolby surround stereo ) is something more complicated ?
Alternative is to call it an "obsc" and to leave it there.
-----Response Message-----

Thank goodness for sequence fans with such familiarity.  I didn't come
across A054775; 10 years older than this public offering.  It would
appear that Mr. S. M. Ellerstein's sequence does indeed make use of the
same properties.  Thank you very much for reviewing.

- Shao Miller

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