A104129 Integers of the form p^(p-1)+p where p is prime.

4, 12, 630, 117656, 25937424612, 23298085122494, 48661191875666868498, 104127350297911241532860, 907846434775996175406740561352, 88540901833145211536614766025207452637390

Offset

1,1

Comments

Sum of the reciprocals 1/a(n) rapidly converges to 0.3349291343132812638... - R. J. Mathar, Apr 27 2007

Links

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

Formula

From R. J. Mathar, Apr 27 2007: (Start)

a(n) = A036878(n)+p where p=A000040(n).

For p>2, a(n) = p*[1+A085531(A005097(n-1))]. (End)

Crossrefs

Cf. A000040, A005097, A036878, A085531.

Sequence in context: A009506 A299808 A085116 * A144631 A009516 A266500

Adjacent sequences: A104126 A104127 A104128 * A104130 A104131 A104132

Keyword

easy,nonn

Author

Cino Hilliard, Mar 06 2005

Extensions

Edited by R. J. Mathar, Apr 27 2007

Status

approved