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A104129

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

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

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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)

MATHEMATICA

#^(#-1)+#&/@Prime[Range[10]] (* Harvey P. Dale, Mar 23 2025 *)

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

URL: https://oeis.org/A104129

⇱ A104129 - OEIS