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A316885 Squares visited by queen moves on a spirally numbered board, always moving to the lowest available unvisited prime square at each step. 2
1, 2, 3, 5, 7, 13, 11, 19, 17, 37, 31, 29, 23, 47, 43, 41, 59, 61, 53, 97, 67, 71, 73, 79, 103, 89, 83, 109, 101, 107, 137, 139, 127, 131, 113, 181, 173, 167, 157, 149, 151, 163, 227, 229, 193, 191, 197, 199, 211, 223, 311, 239, 233, 241, 251, 257, 263, 269 (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..100

Daniël Karssen, Figure showing the first 35 steps of the sequence

CROSSREFS

Sequence in context: A108546 A065107 A185956 * A225039 A264731 A262350

Adjacent sequences:  A316882 A316883 A316884 * A316886 A316887 A316888

KEYWORD

nonn

AUTHOR

Daniël Karssen, Jul 15 2018

STATUS

approved

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Last modified July 18 15:42 EDT 2019. Contains 325144 sequences. (Running on oeis4.)