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 A068226 Neighbor in 2-1 direction of numbers arranged as clockwise spiral. 5
 6, 1, 4, 5, 18, 19, 20, 7, 8, 9, 2, 3, 14, 15, 16, 17, 38, 39, 40, 41, 42, 21, 22, 23, 24, 25, 10, 11, 12, 13, 32, 33, 34, 35, 36, 37, 66, 67, 68, 69, 70, 71, 72, 43, 44, 45, 46, 47, 48, 49, 26, 27, 28, 29, 30, 31, 58, 59, 60, 61, 62, 63, 64, 65, 102, 103, 104, 105, 106, 107 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Any offset (x,y) in this spiral is a permutation of the natural numbers. 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 left of 2, as shown below, then a(1) = 6 because 6 is immediately to the left of 1. 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. A068225 (inverse, right), A334751 (above), A334752 (below). Sequence in context: A021865 A198565 A190409 * A011237 A195433 A358559 Adjacent sequences: A068223 A068224 A068225 * A068227 A068228 A068229 KEYWORD nonn,easy AUTHOR Frank Ellermann, Feb 22 2002 STATUS approved

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Last modified June 17 15:57 EDT 2024. Contains 373463 sequences. (Running on oeis4.)