re A000028 and A000379

[wouter meeussen]

>- Have the team check the programs on A000028 to make sure they match the
> correct version and not the erroneous version.

done:
  iMoebiusMu[ n_ ] := Switch[ MoebiusMu[ n ], 1, 1, -1, -1, 0, If[ OddQ[
Plus@@ (DigitCount[ Last[ Transpose[ FactorInteger[ n ] ] ], 2, 1 ]) ], -1,
1 ] ];
q=Select[Range[20000],iMoebiusMu[#]===-1&];

this exactly reproduces the b-file of A000028.

Could anyone please send me the text of A000028 as it was before september
2001?
I vaguely remember it just said "a two-way classification of the integers" +
reference
but without further details.

Wouter.

----- Original Message ----- 
From: "David Wilson" <davidwwilson at comcast.net>
To: "N. J. A. Sloane" <njas at research.att.com>; "Sequence Fans"
<seqfan at ext.jussieu.fr>
Sent: Friday, December 21, 2007 5:38 AM
Subject: Re: re A000028 and A000379


> I suggest these steps to follow up on the A000028/A0000379 fix:
>
> - On A000028 (and possibly A026416) add the following comment:
>
> %C A000028 Sometime after 1995, the definition of A000028 was changed so
> that it differed from N0187 and A0520. This error was found and corrected
in
> 12/2007. The erroneous version of A000028 was essentially the same as
> A026416.
>
> - A064175 is now a duplicate of A000028. Merge A064175 into A000028 and
kill
> it as a duplicate.
>
> - A064176 is now a duplicate of A000379. Merge A064176 into A000028 and
kill
> it as a duplicate.
>
> - A131180 is a duplicate of A026416. Merge A131180 into A026416. Since
> A131180 is only a couple months old, you might want to just reuse the
> A-number rather than kill it.
>
> - Have the team check the programs on A000028 to make sure they match the
> correct version and not the erroneous version.
>
> - Sift through the OEIS and make sure any references to A000028, A000379,
> A026416 are accurate. References to A064175/A064176/A131180 should be
> changed to A000028/A000379/A026416.
>
>
> ----- Original Message ----- 
> From: "N. J. A. Sloane" <njas at research.att.com>
> To: <seqfan at ext.jussieu.fr>
> Cc: <njas at research.att.com>
> Sent: Thursday, December 20, 2007 9:21 PM
> Subject: re A000028 and A000379
>
>
> > Dear Seqfans:
> >
> > Thanks to everyone who contributed to this discussion.
> > Indeed, the original definitions of A000028 and A000379
> > have somehow been corrupted over the years.
> > I have restored the original definitions, added Maple
> > programs, and recomputed the entries and the b-files.
> >
> > The definition given for A000028 that was there until
> > an hour ago was:
> >
> > %N A000028 A 2-way classification of integers: a(1) = 2, a(2) = 3, and
for
> > n > 2, a(n) is smallest number > a(n-1) not of the form a(i)*a(j) for 1
<=
> > i < j < n.
> >
> > This is not the right definition of A000028 and has now been replaced.
> >
> > I have not been following the discussion about these sequences very
> > closely.  Now that A000028 and A000379 have been corrected,
> > perhaps members of the list can suggest what further changes
> > should be made.
> >
> > Best regards
> >
> > Neil
> >
> >
> >
> > -- 
> > No virus found in this incoming message.
> > Checked by AVG Free Edition.
> > Version: 7.5.503 / Virus Database: 269.17.5/1190 - Release Date:
> > 12/19/2007 7:37 PM
> >
>
>
>
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>