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 A054568 Prime number spiral (clockwise, Southwest spoke). 7
 2, 17, 73, 191, 367, 607, 919, 1297, 1753, 2309, 2909, 3623, 4421, 5303, 6257, 7307, 8447, 9643, 10979, 12421, 13883, 15467, 17203, 19037, 20921, 22853, 24953, 27091, 29389, 31859, 34267, 36847, 39551, 42307, 45233, 48311, 51407, 54547, 57781 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Ivan Panchenko, Table of n, a(n) for n = 0..1000 FORMULA 8-spoke wheel overlays prime number spiral; hub is 2 in shell 0; 8 spokes radiate from this hub; this is Southwest, clockwise. a(n) = A000040(A054569(n+1)). - R. J. Mathar, Aug 29 2018 EXAMPLE Begin a prime number spiral at shell 0 (prime 2), proceed clockwise, Southwest. From Omar E. Pol, Feb 19 2022: (Start) The spiral with four terms in every spoke looks like this: . 227 101--103--107--109--113--127 | | | 223 97 29---31---37---41 131 | | | | | 211 89 23 3----5 43 137 | | | | | | | 199 83 19 2 7 47 139 | | | | | | 197 79 17---13---11 53 149 | | | | 193 73---71---67---61---59 151 | | 191--181--179--173--167--163--157 . (End) MATHEMATICA Table[ Prime[4n^2 - 6n + 3], {n, 1, 40} ] CROSSREFS Cf. A054569, A054551, A054553, A054555, A054564, A054566, A054570, A053999. Sequence in context: A338088 A155715 A307851 * A338087 A235471 A297411 Adjacent sequences: A054565 A054566 A054567 * A054569 A054570 A054571 KEYWORD easy,nonn AUTHOR Enoch Haga and G. L. Honaker, Jr., Apr 10 2000 EXTENSIONS Edited by Robert G. Wilson v, Feb 25 2002 STATUS approved

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Last modified September 25 05:35 EDT 2023. Contains 365582 sequences. (Running on oeis4.)