A144718 a(n) = n-th prime arising A144717.

3, 5, 13, 61, 421, 3361, 30241, 332641, 3991681, 55883521, 950019841, 19000396801, 456009523201, 13680285696001, 465129713664001, 20465707401216001, 1473530932887552001, 125250129295441920001, 10771511119408005120001

Offset: 1

Author

Artur Jasinski, Sep 19 2008

Keywords

• nonn

Links

• Jon E. Schoenfield, Table of n, a(n) for n = 1..282

Crossrefs

Cf. A046966, A046972, A144717, A144718, A144722, A144723, A144724, A144725, A144726, A144727, A144728, A144729, A144730, A144731.

Programs

Mathematica

k = 2; a = {}; Do[If[PrimeQ[k n + 1], AppendTo[a, k n+1 ]; k = k n ], {n, 1, 3000}]; a

Formula

a(n) = 2*Product_{k=1..n} A144717(k) + 1.