%C A068690: 2 is not compatible with {3,5,7}.

[zak seidov]

If definition requires (any)
(absent) non-trivial "explanation",
it  should be (at least) clarified.

Users of OEIS -
it was mentioned a lot of times -
are  not all professional mathematicians.

To me, with English-non-mother-tongue,
%N A068690 means that unit digit is odd
while 2 is not, full stop.

--- Mitch Harris <maharri at gmail.com> wrote:

> I don't know if I disagree. I read 'except' as an
> exclusive or, so
> that the last digit would be in the complement of
> the property being
> 'excepted'. So my initial reaction was to exclude
> '2'. But mine may
> have been an informal reading, rather than a
> mathematical one.
> 
> On reading the comments for this sequence and
> looking up precedence of
> use in the OEIS, I don't think it matters one way or
> the other.
> 
> But now I'm curious...does (and/or should) 'except'
> have the meaning
> of exclusive 'or' or inclusive?
> 
> Mitch
> 
> On Dec 10, 2007 10:09 AM,  <franktaw at netscape.net>
> wrote:
> > I disagree.  The description says that all digits
> except the last are
> > even.  It doesn't say anything about what that
> last digit is.  So all
> > one-digit primes should be included - as they are.
> >
> > Franklin T. Adams-Watters
> >
> > -----Original Message-----
> > From: zak seidov <zakseidov at yahoo.com>
> >
> > %I A068690
> > %S A068690
> >
>
2,3,5,7,23,29,41,43,47,61,67,83,89,223,227,229,241,263
> > %N A068690 Primes with all even digits except the
> > least significant digit.
> > %C A068690 2 is not compatible with {3,5,7}. Or 2
> or
> > {3,5,7} should be omitted.-
> > Zak Seidov (zakseidov(AT)yahoo.com), Dec 10 2007.
> >
> >
>
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> 
> 
> 
> -- 
> Mitch Harris
> 



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