[seqfan] Re: Strict divisors and digits of a(n)
charles.greathouse at case.edu
Sun Dec 1 21:38:48 CET 2013
The English term is "proper divisor". This sequence appears as A132080.
Case Western Reserve University
On Sun, Dec 1, 2013 at 3:20 PM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
> Hello SeqFans,
> I don't know if "strict divisor" (SD) is
> the English translation of the French
> "strict diviseur" -- anyway you will
> understand if I say that the SDs of
> 6 are 1,2 and 3, and (second example),
> the SDs of 28 are 1,2,4,7 and 14.
> Now consider S:
> a(n) will _not_ be part of S if one digit
> of a(n) can be found in one of its SDs:
> SDs of the above integers (2nd column):
> We see that for the above integers,
> no digit at the left of the equal sign
> is repeated at the right of the sign.
> My (naive?) question is:
> -- Is S finite?
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