login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A187805
Numbers n such that (7^n + 6^n)/13 is prime.
7
3, 53, 83, 487, 743
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,1
COMMENTS
All terms are prime.
a(6) > 10^5
LINKS
Table of n, a(n) for n=1..5.
MATHEMATICA
Select[ Prime[ Range[100000] ], PrimeQ[ (7^# + 6^#)/13 ]& ]
PROG
(PARI) is(n)=ispseudoprime((7^n+6^n)/13) \\
Charles R Greathouse IV
, Feb 17 2017
CROSSREFS
Cf.
A181141
,
A128336
,
A128337
.
Sequence in context:
A269458
A288867
A082484
*
A178608
A106997
A141929
Adjacent sequences:
A187802
A187803
A187804
*
A187806
A187807
A187808
KEYWORD
more
,
hard
,
nonn
AUTHOR
Robert Price
, Jan 06 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 September 14 03:52 EDT 2024. Contains 375911 sequences. (Running on oeis4.)