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 A099007 Primes of the form 6n^2 - 2n - 1. 1
 3, 19, 47, 139, 367, 467, 839, 1319, 1699, 1907, 3407, 4003, 4987, 6079, 7703, 10499, 11527, 13159, 16747, 17387, 19379, 23687, 25219, 26003, 30103, 32707, 33599, 35419, 38239, 44203, 50599, 53959, 55103, 57427, 62219, 69767, 72379, 76387 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms are == 3 (mod 4). LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE For n = 2 we have 6*2^2 - 2*2 -1 = 19. MATHEMATICA Select[Table[6n^2-2n-1, {n, 0, 2000}], PrimeQ] (* Vincenzo Librandi, Jul 17 2012 *) PROG (PARI) for(k=1, 120, if(isprime(p=6*k^2-2*k-1), print1(p, ", "))) (MAGMA) [a: n in [0..250] | IsPrime(a) where a is 6*n^2 - 2*n - 1]; // Vincenzo Librandi, Jul 17 2012 CROSSREFS Cf. A098828. Sequence in context: A162905 A201875 A063553 * A023280 A054697 A214883 Adjacent sequences:  A099004 A099005 A099006 * A099008 A099009 A099010 KEYWORD nonn,easy AUTHOR Giovanni Teofilatto, Nov 07 2004 EXTENSIONS Edited, corrected and extended by Klaus Brockhaus, Nov 12 2004 STATUS approved

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Last modified May 24 00:38 EDT 2019. Contains 323528 sequences. (Running on oeis4.)