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A144728 a(n) is the smallest positive integer such that b * (Product_{k=1..n} a(k)) + 1 is prime, with a(n) > a(n-1) for n >= 2, and b = 6. 11

%I #15 Jun 19 2021 12:53:35

%S 1,2,3,5,9,12,16,22,25,29,31,35,47,57,61,66,79,81,108,114,148,163,172,

%T 185,198,203,205,236,265,275,282,294,312,344,359,377,397,398,411,427,

%U 431,493,512,589,647,648,660,708,719,765,887,911,916,935,1062,1093,1102

%N a(n) is the smallest positive integer such that b * (Product_{k=1..n} a(k)) + 1 is prime, with a(n) > a(n-1) for n >= 2, and b = 6.

%t k = 6; a = {}; Do[If[PrimeQ[k n + 1], k = k n; AppendTo[a, n]], {n, 1, 3000}]; a

%Y Cf. A046966, A046972, A144717, A144718, A144722, A144723, A144724, A144725, A144726, A144727, A144729, A144730, A144731.

%K nonn

%O 1,2

%A _Artur Jasinski_, Sep 19 2008

%E Definition corrected by _Georg Fischer_, Jun 18 2021

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Last modified March 29 11:14 EDT 2024. Contains 371278 sequences. (Running on oeis4.)