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 A214664 The x-coordinates of prime numbers in an Ulam spiral oriented counterclockwise with first step east. 17
 1, 1, -1, -1, 2, 2, -2, -2, 0, 3, 3, -3, -3, -3, 1, 4, 2, 0, -4, -4, -4, 2, 5, 5, -1, -5, -5, -5, -5, -3, 6, 6, 2, 0, -6, -6, -6, 0, 4, 7, 7, 7, -1, -3, -7, -7, -7, 5, 8, 8, 8, 8, 8, -2, -8, -8, -8, -8, -4, 0, 2, 9, 9, 5, 3, -1, -9, -9, -5, -3, 1, 7, 10, 10 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS The eight possible orientations of the Ulam spiral can be derived by combining either A214664 or A214666 with either A214665 or A214667 as ordered pairs of coordinates. LINKS William Rex Marshall, Table of n, a(n) for n = 1..10077 (coordinates of primes in a 325 X 325 square). Scientific American, Front Matter, Vol. 210, No. 3, March 1964. CROSSREFS Cf. A000040, A063826, A214665, A214666, A214667. Sequence in context: A341894 A171932 A305629 * A214666 A320471 A333180 Adjacent sequences:  A214661 A214662 A214663 * A214665 A214666 A214667 KEYWORD sign,easy AUTHOR William Rex Marshall, Jul 26 2012 STATUS approved

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Last modified May 22 20:08 EDT 2022. Contains 353957 sequences. (Running on oeis4.)