[seqfan] Re: Adding up numbers of the form 2^a 3^b (A018899)

[Charles Greathouse]

I assume that a and b are allowed to be 0, and that further 0 is
permissible -- or if you prefer, these are the numbers not the sum of at
most n numbers of that form. (This is essentially the only sensible
definition.) With that definition a(0) = 1, a(1) = 5, a(2) = 23, etc.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University


On Wed, Sep 25, 2013 at 10:33 PM, Alonso Del Arte
<alonso.delarte at gmail.com>wrote:

> The definition of A018899 seems to be missing something. "Smallest positive
> integer not representable as the sum of n numbers of form 2^a*3^b." It
> doesn't say whether a and/or b can be 0. Then I stared reading the Berthe &
> Ostrowski paper and I wonder if the definition might be subtly wrong...
>
> Al
>
> --
> Alonso del Arte
> Author at SmashWords.com<
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