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A068225 Neighbor in 1-2 direction of numbers arranged as clockwise spiral. 19
2, 11, 12, 3, 4, 1, 8, 9, 10, 27, 28, 29, 30, 13, 14, 15, 16, 5, 6, 7, 22, 23, 24, 25, 26, 51, 52, 53, 54, 55, 56, 31, 32, 33, 34, 35, 36, 17, 18, 19, 20, 21, 44, 45, 46, 47, 48, 49, 50, 83, 84, 85, 86, 87, 88, 89, 90, 57, 58, 59, 60, 61, 62, 63, 64, 37, 38, 39, 40, 41, 42, 43 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Peter Kagey, Table of n, a(n) for n = 1..10000

Frank Ellermann, Some EIS sequences based on a spiral of natural numbers.

Index entries for sequences that are permutations of the natural numbers.

EXAMPLE

For example, if the spiral is oriented such that 1 is immediately to the right of 2, as shown below, then a(2) = 11 because 11 is immediately to the right of 2.

  21--22--23--24--25--26

  |                    |

  20  7---8---9---10  27

  |   |            |   |

  19  6   1---2   11  28

  |   |       |    |   |

  18  5---4---3   12  29

  |                |   |

  17--16--15--14--13  30

                       |

  36--35--34--33--32--31

CROSSREFS

Cf. A068226 (inverse, left), A334751 (above), A334752 (below).

Cf. A054552 (middle row right), A054567 (middle row left).

Sequence in context: A090009 A153706 A201187 * A043080 A108199 A137904

Adjacent sequences:  A068222 A068223 A068224 * A068226 A068227 A068228

KEYWORD

nonn,easy

AUTHOR

Frank Ellermann, Feb 22 2002

STATUS

approved

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Last modified July 24 01:41 EDT 2021. Contains 346269 sequences. (Running on oeis4.)