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 A144724 a(n) = smallest positive integer k such that a(0)*a(1)*a(2)*...*a(n) + 1 is prime. a(0)=4. 14
 1, 3, 5, 7, 8, 9, 11, 12, 14, 17, 20, 24, 30, 34, 44, 72, 85, 86, 92, 115, 122, 125, 132, 142, 150, 161, 162, 181, 186, 198, 224, 248, 252, 282, 283, 290, 307, 319, 321, 344, 350, 376, 445, 476, 567, 623, 676, 682, 704, 741, 749, 786, 803, 806, 893, 1014, 1046, 1079 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA k = 4; a = {}; Do[If[PrimeQ[k n + 1], k = k n; AppendTo[a, n]], {n, 1, 3000}]; a (*Artur Jasinski*) CROSSREFS Cf. A046966, A046972, A144717, A144718, A144722, A144723, A144724, A144725, A144726, A144727, A144728, A144729, A144730, A144731. Sequence in context: A325417 A183868 A299542 * A196990 A060462 A072668 Adjacent sequences:  A144721 A144722 A144723 * A144725 A144726 A144727 KEYWORD nonn AUTHOR Artur Jasinski, Sep 19 2008 STATUS approved

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Last modified January 20 19:53 EST 2020. Contains 331096 sequences. (Running on oeis4.)