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A316884 Squares visited by moving diagonally one square on a spirally numbered board and moving to the lowest available unvisited square at each step. 10
1, 3, 11, 9, 23, 7, 19, 5, 15, 33, 13, 29, 53, 27, 25, 47, 77, 45, 21, 41, 69, 39, 17, 35, 61, 95, 59, 31, 55, 87, 127, 85, 51, 49, 79, 117, 163, 115, 75, 43, 71, 107, 151, 105, 67, 37, 63, 97, 139, 189, 137, 93, 57, 89, 129, 177, 233, 175, 125, 83, 81, 119 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Board is numbered with the square spiral:

.

  17--16--15--14--13

   |               |

  18   5---4---3  12   .

   |   |       |   |

  19   6   1---2  11   .

   |   |           |

  20   7---8---9--10   .

   |

  21--22--23--24--25--26

LINKS

Daniël Karssen, Table of n, a(n) for n = 1..10000

Daniël Karssen, Figure showing the first 49 steps of the sequence

CROSSREFS

Cf. A316667, A316671.

Sequence in context: A330566 A205120 A070613 * A084409 A038229 A257538

Adjacent sequences:  A316881 A316882 A316883 * A316885 A316886 A316887

KEYWORD

nonn

AUTHOR

Daniël Karssen, Jul 15 2018

STATUS

approved

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Last modified August 3 16:28 EDT 2021. Contains 346439 sequences. (Running on oeis4.)