A125137 a(n) = p^p + 1, where p = prime(n).

5, 28, 3126, 823544, 285311670612, 302875106592254, 827240261886336764178, 1978419655660313589123980, 20880467999847912034355032910568, 2567686153161211134561828214731016126483470, 17069174130723235958610643029059314756044734432, 10555134955777783414078330085995832946127396083370199442518

Offset: 1

Author

N. J. A. Sloane, Jan 21 2007

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..77

Crossrefs

See A125136 for factorizations. Cf. A088730, A125135.

Cf. A104131, A114846.

Programs

Magma

[p^p+1: p in PrimesUpTo(40)]; // Vincenzo Librandi, Mar 27 2014

Mathematica

Table[Prime[n]^Prime[n] + 1, {n , 20}] (* Vincenzo Librandi, Mar 27 2014 *)

Formula

a(n) = A051674(n)+1. - R. J. Mathar, Apr 23 2007