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 A054566 Prime number spiral (clockwise, South spoke). 9
 2, 13, 67, 173, 347, 577, 877, 1249, 1697, 2243, 2833, 3541, 4289, 5179, 6131, 7159, 8293, 9473, 10799, 12251, 13709, 15289, 16987, 18749, 20681, 22619, 24671, 26839, 29129, 31541, 33911, 36559, 39217, 41981, 44839, 47903, 50989, 54163, 57347 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS 8-spoke wheel overlays prime number spiral; hub is 2 in shell 0; 8 spokes radiate from this hub; this is South, clockwise. LINKS Ivan Panchenko, Table of n, a(n) for n = 0..1000 FORMULA a(n) = A000040(A054567(n+1)). - Omar E. Pol, Feb 20 2022 EXAMPLE Begin a prime number spiral at shell 0 (prime 2), proceed clockwise, South. 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 - 7n + 4], {n, 1, 40} ] CROSSREFS Cf. A000040, A054567, A054551, A054553, A054555, A054564, A054568, A054570, A053999. Sequence in context: A137967 A045764 A106999 * A038144 A097977 A136780 Adjacent sequences: A054563 A054564 A054565 * A054567 A054568 A054569 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 February 21 03:13 EST 2024. Contains 370219 sequences. (Running on oeis4.)