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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 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: A145662 A094418 A008543 * A141357 A093352 A293013 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 August 6 12:33 EDT 2020. Contains 336246 sequences. (Running on oeis4.)