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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A128355 Numbers k such that A122735(n) = n^k - k^n. 1
0, 5, 4, 0, 14, 7, 20, 11, 10, 273, 14, 13, 38, 89, 68, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A122735(n) = {1, 7, 17, 1, 6102977801, 162287, 79792265017612001, ...} Smallest prime of the form (n^k - k^n) for k>1, or 1 if such prime does not exist. Currently a(n) is not known for n = {17,18,22,25,26,27,28,...}.

LINKS

Table of n, a(n) for n=1..16.

CROSSREFS

Cf. A122735.

Sequence in context: A227966 A021653 A020847 * A325221 A129522 A133842

Adjacent sequences:  A128352 A128353 A128354 * A128356 A128357 A128358

KEYWORD

hard,more,nonn

AUTHOR

Alexander Adamchuk, Mar 05 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 April 21 04:56 EDT 2019. Contains 322310 sequences. (Running on oeis4.)