[seqfan] Fwd: Add neighbours, use their digits

M. F. Hasler oeis at hasler.fr
Sat Nov 2 14:20:00 CET 2013

On Sat, Nov 2, 2013 at 5:22 AM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
> Hello SeqFans,
> this is a nightmare to compute by hand:
> S = 1,10,2,19,73,100,3,20,4,39,54,...

Hello Eric,
for the computer that's very easy:



Note that I do not consider multiplicity : "to write 11", it is
sufficient that there is one digit "1" in a(n),a(n+1). Hope that's OK.

Have a nice week-end,


> Let R be a(n)+a(n+1)
> We want R to be written with some (or
> all) the digits belonging to a(n) or a(n+1)
> or both.
> S is extended using the smallest
> integer not yet present in S and
> not leading to a contradiction.

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