login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
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
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
Sequence in context: A220206 A218081 A219823 * A249707 A228140 A156674
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.)