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A090915 Permutation of natural numbers arising from a spiral. 0
1, 8, 7, 6, 5, 4, 3, 2, 9, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 25, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 49, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Write out the natural numbers in a square counter-clockwise 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

Now read off the numbers in a clockwise spiral: 1 -> 8 -> 7 -> 6 -> 5 -> 4 -> 3 -> 2 -> 9 -> etc.

CROSSREFS

Sequence in context: A180598 A031311 A055119 * A194756 A132672 A132037

Adjacent sequences:  A090912 A090913 A090914 * A090916 A090917 A090918

KEYWORD

easy,nonn

AUTHOR

Felix Tubiana (fat2(AT)columbia.edu), Feb 26 2004

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Last modified February 17 13:24 EST 2012. Contains 206031 sequences.