[seqfan] Strict divisors and digits of a(n)
Eric.Angelini at kntv.be
Sun Dec 1 21:20:19 CET 2013
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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