[seqfan] Re: A103969 is wrong, maybe useless

Maximilian Hasler maximilian.hasler at gmail.com
Sat Mar 6 10:15:38 CET 2010

I don't know well Mmca either, but I'm quite sure that A005941(63)=64 is wrong ;
Probably there is one term missing somewhere before A005941(62) =?= 39
(39 should be the correct value for A005941(63) according to A5940(39) = 63.)


On Sat, Mar 6, 2010 at 9:49 AM,  <franktaw at netscape.net> wrote:
> http://www.research.att.com/~njas/sequences/A103969 is titled "Numbers
> n such that n=A005941(A005940(n))."  But A005941 is "Inverse of the
> Doudna sequence A005940.", so this should be just the positive
> integers.  And indeed, the numbers not in A103969 do nevertheless have
> n=A005941(A005940(n)).
> There is a Mathematica program in A103969, so it must be computing
> something.  I can't really tell what, from a quick examination.  Is
> this just a buggy program and a sequence that should  not be present,
> or is it something of some possible interest?
> Franklin T. Adams-Watters
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