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A033988
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Write 0,1,2,... in clockwise spiral, writing each digit in separate square; sequence gives numbers on positive y axis.
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16
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0, 5, 1, 4, 3, 7, 8, 0, 4, 7, 7, 1, 2, 6, 2, 1, 8, 7, 4, 2, 6, 1, 8, 9, 2, 7, 6, 0, 6, 5, 1, 2, 0, 4, 1, 5, 8, 5, 1, 8, 8, 8, 2, 1, 2, 3, 2, 4, 9, 0, 2, 8, 9, 9, 3, 3, 2, 0, 3, 7, 9, 3, 4, 2, 8, 8, 4, 7, 1, 5, 5, 3, 7, 4, 5, 9, 7, 5, 6, 5, 9, 8, 7, 1, 5, 3, 7, 8, 4, 0, 8, 5, 6, 9, 9, 3, 1, 0, 9, 8, 1, 1, 6, 9, 9
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| In other words, write 0 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 ... in a clockwise spiral, starting with the 0.
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EXAMPLE
| ............
...131416...
...245652...
...130717...
...121862...
...101918...
............
We begin with the 0 and wrap the numbers 1 2 3 4 ... around it
After one loop we have reached
456
307
218
After two loops we see
13141
24565
13071
12186
10191
and so on.
Then the sequence is obtained by reading vertically upwards, starting from the initial 0.
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CROSSREFS
| Sequences from spirals: A001107, A002939, A007742, A033951, A033952, A033953, A033954, A033989, A033990, A033991, A002943, A033996, A033988.
Sequence in context: A108170 A086988 A010132 * A200421 A019977 A169978
Adjacent sequences: A033985 A033986 A033987 * A033989 A033990 A033991
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KEYWORD
| nonn,easy,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Andrew Gacek (andrew(AT)dgi.net).
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