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 A054553 Prime number spiral (clockwise, Northeast spoke). 9
 2, 5, 41, 127, 269, 467, 751, 1093, 1523, 2027, 2621, 3299, 4007, 4861, 5749, 6763, 7867, 9041, 10273, 11719, 13121, 14723, 16319, 18061, 19963, 21851, 23857, 26021, 28289, 30661, 33029, 35531, 38201, 40993, 43759, 46751, 49789, 52957, 56197 (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 Northeast, clockwise. LINKS Ivan Panchenko, Table of n, a(n) for n = 0..1000 FORMULA a(n) = A000040(A054554(n+1)). - R. J. Mathar, Aug 29 2018 EXAMPLE Begin a prime number spiral at shell 0 (prime 2), proceed clockwise, Northeast. 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 - 10n + 7], {n, 1, 40} ] PROG (Magma) [NthPrime(4*n^2 - 10*n + 7): n in [1..40]]; // Vincenzo Librandi, Aug 29 2018 CROSSREFS Cf. A000040, A054554, A054551, A054555, A054564, A054566, A054568, A054570, A053999. Sequence in context: A072439 A286560 A002592 * A185052 A088547 A009457 Adjacent sequences: A054550 A054551 A054552 * A054554 A054555 A054556 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 02:30 EST 2024. Contains 370219 sequences. (Running on oeis4.)