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!)
A230139 Numbers n such that (17^n - 4^n)/13 is prime. 0
3, 5, 7, 11, 31, 101, 887, 4861 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
All terms are prime.
a(9) > 10^5.
LINKS
MATHEMATICA
Select[Prime[Range[1, 100000]], PrimeQ[(17^# - 4^#)/13]&]
PROG
(PARI) is(n)=ispseudoprime((17^n-4^n)/13) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A265788 A061245 A361898 * A242944 A137355 A147143
KEYWORD
nonn,hard,more
AUTHOR
Robert Price, Oct 10 2013
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 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)