[seqfan] Re: Variation on an infinite Sudoku-type array
Zak Seidov
zakseidov at mail.ru
Sun Jul 3 01:30:53 CEST 2016
Dear Kerry,
This is exactly my "old spiral",
see my post to [seqfan] 30 june, 14:05 .
Apparently nobody noticed it in the "hectic" thread
"Sudoku-type array":(
Zak
PS But you've calculated great figures!
While I just mentioned the "idea".
Congrats!
>Суббота, 2 июля 2016, 22:36 +03:00 от Kerry Mitchell <lkmitch at gmail.com>:
>
>Hi all,
>
>This is a spinoff from the "A269526, an infinite Sudoku-type array" thread.
>
>I was intrigued by the idea in the original thread and wanted to try some
>variations. I didn't like the antidiagonals approach because of the break
>at the end of a line, jumping down to the next line. So I tried with a
>square spiral (ala Ulam spiral), so that each newly populated cell is
>adjacent to the previous cell. Here are the central 121 cells:
>
>09 16 02 04 07 14 11 12 01 05 08
>17 08 15 14 13 12 09 10 06 07 03
>01 02 04 11 10 03 08 07 09 13 15
>08 09 07 03 05 06 01 02 04 12 11
>11 12 08 01 02 04 03 06 05 10 14
>15 07 06 05 03 01 02 04 08 11 12
>14 10 03 02 04 05 06 01 07 09 13
>07 11 09 06 01 02 04 05 03 08 10
>04 13 05 07 08 09 10 11 12 06 01
>12 14 10 09 06 13 05 03 15 16 07
>10 15 01 12 16 08 14 13 11 18 17
>
>The sequence begins with "01" in the center. Here's a list of those
>values, in order:
>
>1
>2
>3
>4
>2
>3
>4
>5
>6
>1
>4
>6
>2
>1
>6
>5
>3
>1
>5
>2
>6
>1
>2
>4
>5
>3
>7
>8
>5
>4
>9
>7
>8
>3
>10
>11
>4
>7
>8
>6
>3
>9
>5
>7
>8
>9
>10
>11
>12
>6
>8
>9
>11
>10
>12
>13
>7
>6
>10
>9
>12
>13
>14
>15
>8
>2
>9
>12
>7
>10
>11
>13
>14
>10
>9
>6
>13
>5
>3
>15
>16
>7
>1
>10
>13
>12
>14
>11
>15
>3
>8
>5
>1
>12
>11
>14
>7
>4
>2
>16
>9
>17
>1
>8
>11
>15
>14
>7
>4
>12
>10
>15
>1
>12
>16
>8
>14
>13
>11
>18
>17
>
>And here are a couple of images of the sequence. In the first, the colors
>represent the values, from black (small) to white (large). In the second,
>values <= 100 are black and those > 100 are white.
>
>http://www.kerrymitchellart.com/temp/spiral-low.jpg
>http://www.kerrymitchellart.com/temp/spiral-high.jpg
>
>Kerry
>
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