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 A068225 Neighbor in 1-2 direction of numbers arranged as clockwise spiral. 16
 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 F. Ellermann, Some EIS sequences based on a spiral of natural numbers. EXAMPLE 7 8 9 10: ..., a(7)= 8, a(8)= 9, a(9)= 10, ... 6 1 2 11: ..., a(6)= 1, a(1)= 2, a(2)= 11, ... (see A054552, A054567). 5 4 3 12: ..., a(5)= 4, a(4)= 3, a(3)= 12, ... CROSSREFS n = A068226(A068225(n)). Right (left) part of middle row is A054552 (A054567). 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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