login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A104129 Integers of the form p^(p-1)+p where p is prime. 1
4, 12, 630, 117656, 25937424612, 23298085122494, 48661191875666868498, 104127350297911241532860, 907846434775996175406740561352, 88540901833145211536614766025207452637390 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 29 09:50 EST 2021. Contains 349416 sequences. (Running on oeis4.)