[seqfan] Re: Did you know that?

[Neil Sloane]

Re bar codes:

The "left side" bar code seems to be that digits are encoded as follows:
0 = 0001101
1 = 0011001
2 = 0010011
...
9 = 0001011
according to one web site I found.

So let's start with 0 and ask for a sequence which is its own bar code

Since 0 = 0001101 and 1 = 0011001, the sequence would start

0001101 0001101 0001101 0011001 0011001   0001101 0011001 ...

or in other words

0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1,
0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, ...

John, have I understood the code correctly?  I'm assuming the sequence has
no "guard digits"
at the start, is infinite, and we only use the "left half" code






Best regards
Neil

Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com


On Thu, Aug 4, 2016 at 8:17 AM, <john.mason at lispa.it> wrote:

> Did you know that the pin plot of A257585 https://oeis.org/A257585/graph,
> interpreted as a barcode, becomes 12157648?
> Are there other barcodes in OEIS?
> john
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