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 A144728 a(n)= smallest positive integer k such that a(0)*a(1)*a(2)*...*a(n) + 1 is prime. a(0)=6 13
 1, 2, 3, 5, 9, 12, 16, 22, 25, 29, 31, 35, 47, 57, 61, 66, 79, 81, 108, 114, 148, 163, 172, 185, 198, 203, 205, 236, 265, 275, 282, 294, 312, 344, 359, 377, 397, 398, 411, 427, 431, 493, 512, 589, 647, 648, 660, 708, 719, 765, 887, 911, 916, 935, 1062, 1093, 1102 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA k = 6; a = {}; Do[If[PrimeQ[k n + 1], k = k n; AppendTo[a, n]], {n, 1, 3000}]; a (*Artur Jasinski*) CROSSREFS A046966, A046972, A144717, A144718, A144722, A144723, A144724, A144725, A144726, A144727, A144728, A144729, A144730, A144731 Sequence in context: A161412 A099420 A184794 * A051147 A316154 A079741 Adjacent sequences:  A144725 A144726 A144727 * A144729 A144730 A144731 KEYWORD nonn AUTHOR Artur Jasinski, Sep 19 2008 STATUS approved

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Last modified April 6 14:08 EDT 2020. Contains 333276 sequences. (Running on oeis4.)