A088816 Numbers of the form p^p - 2 where p is prime.

2, 25, 3123, 823541, 285311670609, 302875106592251, 827240261886336764175, 1978419655660313589123977, 20880467999847912034355032910565, 2567686153161211134561828214731016126483467

Offset

1,1

Comments

Sum of reciprocals = 0.5403214192032919719402677251

Links

Table of n, a(n) for n=1..10.

Formula

a(n) = A088730(n)-1=A088731(n)+1. - R. J. Mathar, Apr 26 2007

Mathematica

#^#-2&/@Prime[Range[10]] (* Harvey P. Dale, Sep 22 2014 *)

Prog

(PARI) ptop(n, m) = { sr=0; forprime(x=2, n, y=x^x-m; print1(y", "); sr += 1.0/y; ); print(); print(sr) }

Crossrefs

Sequence in context: A278273 A210836 A369675 * A323589 A141415 A056948

Adjacent sequences: A088813 A088814 A088815 * A088817 A088818 A088819

Keyword

nonn

Author

Cino Hilliard, Nov 23 2003

Status

approved