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 A054570 Prime number spiral (clockwise, West spoke). 8
 2, 19, 83, 199, 389, 641, 967, 1361, 1823, 2377, 3001, 3709, 4517, 5419, 6353, 7477, 8623, 9791, 11159, 12577, 14083, 15667, 17417, 19273, 21149, 23063, 25229, 27431, 29683, 32183, 34543, 37171, 39877, 42641, 45599, 48673, 51719, 54973, 58171 (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 West, clockwise. a(n) = A000040(A033951(n)). - R. J. Mathar, Aug 29 2018 EXAMPLE Begin a prime number spiral at shell 0 (prime 2), proceed clockwise, West. 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 + 3n + 1], {n, 0, 40} ] CROSSREFS Cf. A033951, A054551, A054553, A054555, A054564, A054566, A054570, A053999. Sequence in context: A240280 A327820 A331898 * A135436 A056005 A034572 Adjacent sequences: A054567 A054568 A054569 * A054571 A054572 A054573 KEYWORD easy,nonn AUTHOR Enoch Haga and G. L. Honaker, Jr., Apr 10 2000 EXTENSIONS Edited by Frank Ellermann, Feb 24 2002 STATUS approved

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Last modified November 28 12:20 EST 2022. Contains 358416 sequences. (Running on oeis4.)