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A033989
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Write 0,1,2,... in clockwise spiral, writing each digit in separate square; sequence gives numbers on negative x axis.
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15
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0, 3, 1, 1, 3, 2, 7, 9, 1, 1, 6, 9, 4, 7, 9, 1, 2, 1, 2, 1, 6, 7, 4, 3, 6, 1, 2, 9, 5, 1, 1, 0, 9, 3, 1, 3, 6, 6, 1, 8, 6, 9, 2, 5, 0, 2, 2, 4, 6, 6, 2, 5, 6, 0, 3, 8, 9, 5, 3, 3, 6, 9, 4, 0, 5, 4, 4, 9, 8, 0, 5, 0, 4, 5, 5, 3, 3, 1, 6, 8, 5, 8, 6, 5, 1, 4, 7, 4, 9, 1, 8, 5, 1, 9, 9, 8, 6, 6, 9, 1, 1, 6, 4, 8, 1
(list;
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internal format)
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..104.
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FORMULA
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a(n) = A033307(4*n^2-n-1) for n > 0. [Andrew Woods, May 20 2012]
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EXAMPLE
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..1-3-1-4-1..
..|.......|..
..2.4-5-6.5..
..|.|...|.|..
..1.3.0.7.1..
..|.|.|.|.|..
..1.2-1.8.6..
..|.....|.|..
..1-0-1-9.1..
We begin with the 0 and wrap the numbers 1 2 3 4 ... around it. Then the sequence is obtained by reading leftwards, starting from the initial 0. - Andrew Woods, May 20 2012
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CROSSREFS
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Sequences based on the same spiral: A033953, A033988, A033990. Spiral without zero: A033952.
Other sequences from spirals: A001107, A002939, A007742, A033951, A033954, A033991, A002943, A033996, A033988.
Sequence in context: A225335 A143159 A184831 * A169941 A099545 A132429
Adjacent sequences: A033986 A033987 A033988 * A033990 A033991 A033992
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KEYWORD
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nonn,base,easy,nice
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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More terms from Andrew J. Gacek (andrew(AT)dgi.net)
Edited by Charles R Greathouse IV, Nov 01 2009
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STATUS
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approved
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