[seqfan] Re: a(n) = a(n-1) + [sum of all digits present so far]
Jonathan Post
jvospost3 at gmail.com
Thu Oct 1 18:43:04 CEST 2009
It's an infinite array, indexed by the initial value(s). I suggest
showing the array explicitly (at least a 2-D slice) and the main
diagonal as a derived sequence.
-- Prof. Jonathan Vos Post
On Thu, Oct 1, 2009 at 9:23 AM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
>
> Hello SeqFans,
> this seems not to be in the OEIS (else I need new glasses):
>
> S = 1, 2, 5, 13, 25, 44, 71, 106, 113, ...
>
> a(1) = 1
> a(n) = a(n-1) + [sum of all digits present so far in S]
>
> (thus 25 = 13 + 1 + 2 + 5 + 1 + 3)
>
> Best,
> É.
>
>
>
>
>
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