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 A185586 EKG sequence (A064413) written clockwise as a square spiral and read counterclockwise. 2
 2, 1, 6, 4, 18, 15, 5, 10, 8, 12, 9, 3, 24, 21, 7, 14, 36, 39, 13, 26, 28, 35, 25, 30, 27, 33, 11, 22, 20, 16, 38, 42, 51, 17, 34, 32, 58, 70, 65, 55, 60, 63, 49, 56, 54, 52, 50, 48, 69, 23, 46, 44, 40, 45, 57, 19, 64, 72, 93, 31, 62, 66, 87, 29, 141, 47, 94, 92, 100 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A permutation of the natural numbers. The subsequence of primes (A000040) begins: 2, 5, 3, 7, 13, 11, 17, 23, 19, 31, 29, 47, 43, 41, 37, 53, ... LINKS Alois P. Heinz, Table of n, a(n) for n = 1..10000 J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG sequence, Exper. Math. 11 (2002), 437-446. J. C. Lagarias, E. M. Rains and N. J. A. Sloane, The EKG Sequence I. Peterson, The EKG Sequence Eric Weisstein's World of Mathematics, EKG Sequence EXAMPLE 1,2,4,6,3,9,12,8,10,5,15,18,... are written clockwise as a square spiral, then read counterclockwise: 2,1,6,4,18,15,5,10,8,12,9,3,... The square spiral begins: 33 27 30 25 35 28 11 12  8 10  5 26 22  9  1  2 15 13 20  3  6  4 18 39 16 24 21  7 14 36 38 42 51 17 34 32 CROSSREFS Cf. A064413. Sequence in context: A155550 A268754 A005299 * A128728 A084950 A180317 Adjacent sequences:  A185583 A185584 A185585 * A185587 A185588 A185589 KEYWORD nonn AUTHOR Paul Curtz, Feb 04 2011 STATUS approved

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