login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A104128 a(n) = p + p^(p+1), where p = prime(n). 2
10, 84, 15630, 5764808, 3138428376732, 3937376385699302, 14063084452067724991026, 37589973457545958193355620, 480250763996501976790165756943064, 74462898441675122902293018227199467668020630, 529144398052420314716929933900838757437386767392 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Sum of reciprocals rapidly converges to 0.11196891489794721930017828981362..

LINKS

Ray Chandler, Table of n, a(n) for n = 1..76

FORMULA

a(n) = A000040(n) + A104126(n).

MATHEMATICA

Table[p + p^(p+1), {p, Prime[Range[12]]}] (* Robert G. Wilson v, Feb 27 2012 *)

PROG

(Maxima) A104128(n) := block(

        return(A000040(n)^(1+A000040(n))+A000040(n))

)$ /* R. J. Mathar, Feb 27 2012 */

(PARI) A104128(n)=(n=prime(n))+n^(n+1)   \\ - M. F. Hasler, Feb 26 2012

CROSSREFS

Sequence in context: A287826 A155593 A239990 * A014341 A253009 A291389

Adjacent sequences:  A104125 A104126 A104127 * A104129 A104130 A104131

KEYWORD

easy,nonn,changed

AUTHOR

Cino Hilliard, Mar 06 2005

EXTENSIONS

Definition corrected and incorrect program removed. - R. J. Mathar, Feb 27 2012

More terms from Harvey P. Dale, Feb 27 2012

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 21 07:06 EST 2017. Contains 294992 sequences.