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A363247
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a(0) = 0. a(n) = the smallest nonnegative integer, excluding a(n-1), not occurring in all occurrences of a(n-1)'s eight neighbors thus far in a square spiral.
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1
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0, 1, 2, 3, 4, 1, 5, 2, 4, 5, 3, 6, 0, 7, 1, 8, 0, 9, 2, 8, 6, 4, 7, 8, 10, 0, 11, 1, 10, 2, 11, 4, 12, 2, 13, 3, 9, 5, 12, 3, 14, 0, 15, 1, 14, 5, 13, 4, 15, 2, 16, 1, 17, 0, 18, 1, 19, 0, 20, 1, 21, 0, 22, 1, 23, 0, 24, 1, 25, 0, 26, 1, 27, 0, 28, 2, 17, 3
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OFFSET
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0,3
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LINKS
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EXAMPLE
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The spiral begins:
0---8---1---7---0
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9 4---3---2 6
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2 1 0---1 3 .
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8 5---2---4---5 .
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6---4---7---8---10--0
a(0) = 0
a(1) = 1. Smallest integer that's not a neighbor to every 0 = 1.
a(2) = 2. Smallest integer that's not a neighbor to every 1 = 2.
a(3) = 3. Smallest integer that's not a neighbor to every 2 = 3.
a(4) = 4. Smallest integer that's not a neighbor to every 3 = 4.
a(5) = 1. Smallest integer that's not a neighbor to every 4 = 1.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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