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 A057130 Product of first n primes of form 6k-1. 3
 5, 55, 935, 21505, 623645, 25569445, 1201763915, 63693487495, 3757915762205, 266812019116555, 22145397586674065, 1970940385213991785, 199064978906613170285, 21299952743007609220495, 2406894659959859841915935, 315303200454741639290987485 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..16. FORMULA a(n) = a(n-1)*A007528(n) = (A057131(n)+1)/6. EXAMPLE a(3) = 5*11*17 = 935. a(4) = 21505 = 5 * 11 * 17 * 23. PROG (PARI) lista(nn) = {pp = 1; for (n = 1, nn, p = prime(n); if (Mod(p, 6) == -1, pp *= p; print1(pp, ", ")); ); } \\ Michel Marcus, Sep 08 2013 CROSSREFS Cf. A000040, A002110, A002476, A006278, A007528, A074040, A078586, A121940. Cf. A008543, A057131. Sequence in context: A365588 A367164 A008543 * A141357 A357394 A093352 Adjacent sequences: A057127 A057128 A057129 * A057131 A057132 A057133 KEYWORD nonn,easy AUTHOR Henry Bottomley, Aug 11 2000 EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), Oct 06 2000 More terms from Michel Marcus, Sep 08 2013 STATUS approved

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Last modified November 29 00:31 EST 2023. Contains 367422 sequences. (Running on oeis4.)