A208506 p^(p+1) + (p+1)^p, where p = prime(n).

17, 145, 23401, 7861953, 3881436747409, 4731091158953433, 16248996011806421522977, 42832853457545958193355601, 535823088031930481975544151644865, 81325936178163422902293018227199467668020601

Offset: 1

Author

M. F. Hasler, Feb 27 2012

Keywords

• nonn

Comments

The definition has been the erroneous description of A104128 (as pointed out by H. P. Dale), prior to correction by R. J. Mathar on Feb 27 2012.

Sum of reciprocals rapidly converges to 0.065762941547548273299583...

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..70

Programs

Mathematica

ok[n_] := n^(n+1)+(n+1)^n; Table[ok[n], {n, Prime[Range[10]]}] (* Harvey P. Dale, Feb 27 2012 *)

PARI

A208506(n)=(1+n=prime(n))^n+n^(n+1)