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A187805
Numbers n such that (7^n + 6^n)/13 is prime.
7
3, 53, 83, 487, 743
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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
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Last modified June 12 19:52 EDT 2024. Contains 373360 sequences. (Running on oeis4.)