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A144726 a(n) is the smallest integer greater than a(n-1) such that a(1)*a(2)*...*a(n) + 1 is prime. 13
2, 3, 5, 7, 10, 12, 14, 15, 19, 21, 26, 29, 30, 39, 41, 56, 62, 77, 96, 105, 112, 113, 115, 121, 136, 145, 159, 168, 188, 236, 240, 258, 281, 305, 324, 362, 376, 422, 521, 588, 639, 643, 652, 695, 698, 737, 770, 776, 784, 806, 807, 809, 818, 959, 1023, 1060, 1071 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

MATHEMATICA

k = 5; 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: A191211 A263133 A254860 * A123885 A010062 A119565

Adjacent sequences:  A144723 A144724 A144725 * A144727 A144728 A144729

KEYWORD

nonn

AUTHOR

Artur Jasinski, Sep 19 2008

EXTENSIONS

Definition corrected at the suggestion of Zak Seidov, Nov 19 2012

STATUS

approved

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Last modified May 23 07:08 EDT 2019. Contains 323508 sequences. (Running on oeis4.)