[seqfan] Numbers impossible to produce
Eric.Angelini at kntv.be
Thu Apr 14 13:41:33 CEST 2011
The integer 126 produces 38 like this:
1 2 6
A digit on the base line is the addition
of the two closest digits above it.
What does the integer 176 produce?
We decide that if the sum a+b of the said
digits is greater than 9, than we subtract
a from b (or b from a if a > b):
1 7 6
So, we managed to produce 38 and 81; but
what could be the smallest number that
would be impossible to produce, according
to the above rule?
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