[seqfan] Re: Look and Say novelty? (correction)
Alexander Povolotsky
apovolot at gmail.com
Thu Jan 29 15:55:27 CET 2009
One would want to apply some operation (subtraction doesn't work) to
the pair of adjacent terms -
to see what what types of digits (in range from 1 to 9) got increase
in their quantatity in transition from previous term to the next.
Is such operation possible (mathematically describable) ?
Cheers,
ARP
=============================
On Thu, Jan 29, 2009 at 7:16 AM, Eric Angelini <Eric.Angelini at kntv.be> wrote:
> Hello SeqFans,
>
> I like this finite one -- which kind of self-constructs nicely:
>
> S = 22, 3233, 424344
> 52535455
> 6263646566
> 727374757677
> 82838485868788
> 9293949596979899
>
> ... a(n) says: "Look, we have so far in the sequence (including my
> digits), this quantity of digits 'a', that quantity of digits 'b',
> etc."
>
> Example: a(2) says "there are three 2's far (including my digits)"
> -> yes, the two 2's of a(1) and the '2' of a(2);
> "there are three 3's so far"
> -> yes, my three 3's.
>
> a(3) says "there are four 2's, four 3's, four 4's so far
> (including my digits)"
> -> yes, ...
>
> Are there other such sequences, with different starts for instance?
> (I'm searching a sequence containing 1's).
>
> Best,
> É.
>
>
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