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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. 9
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: A050097 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 June 20 09:12 EDT 2019. Contains 324234 sequences. (Running on oeis4.)