[seqfan] Re: Numbers impossible to produce

[Claudio Meller]

1370

2011/4/14 Eric Angelini <Eric.Angelini at kntv.be>

> Hello SeqFans,
>
> The integer 126 produces 38 like this:
>
>  1 2 6
>  3 8
>
> 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
>  8 1
>
> 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?
>
> Best,
> É.
>
>
>
>
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>
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>



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Claudio
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