login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A216591
Numbers k such that 8^k + k^8 - 1 is prime.
1
10, 38, 428, 824, 3902, 4712, 5596, 29572
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,1
COMMENTS
a(9) > 10^5.
Robert Price
, Feb 25 2014
LINKS
Table of n, a(n) for n=1..8.
MATHEMATICA
Select[Range[0, 4000], PrimeQ[8^# + #^8 - 1] &]
PROG
(PARI) is(n)=ispseudoprime(8^n+n^8-1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Cf.
A100357
,
A215434
-
A215446
,
A216375
.
Sequence in context:
A220206
A218081
A219823
*
A249707
A228140
A156674
Adjacent sequences:
A216588
A216589
A216590
*
A216592
A216593
A216594
KEYWORD
nonn
,
hard
,
more
AUTHOR
Vincenzo Librandi
, Sep 09 2012
EXTENSIONS
a(6)-a(8) from
Robert Price
, Feb 25 2014
STATUS
approved
Lookup
|
Welcome
|
Wiki
|
Register
|
Music
|
Plot 2
|
Demos
|
Index
|
Browse
|
More
|
WebCam
Contribute new seq. or comment
|
Format
|
Style Sheet
|
Transforms
|
Superseeker
|
Recents
The OEIS Community
| Maintained by
The OEIS Foundation Inc.
License Agreements, Terms of Use, Privacy Policy.
.
Last modified March 19 01:57 EDT 2024. Contains 370952 sequences. (Running on oeis4.)