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A180740
Numbers k such that 7^k+5^k+1 is prime.
0
0, 1, 11, 731, 3029
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OFFSET
1,3
LINKS
Table of n, a(n) for n=1..5.
PROG
(Magma) [n: n in [0..700]|IsPrime(7^n+5^n+1)]
(PARI) is(n)=ispseudoprime(7^n+5^n+1) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A267954
A206646
A267908
*
A330309
A110776
A058392
Adjacent sequences:
A180737
A180738
A180739
*
A180741
A180742
A180743
KEYWORD
nonn
,
more
AUTHOR
Vincenzo Librandi
, Jan 22 2011
EXTENSIONS
a(4)-a(5) from
D. S. McNeil
, Jan 24 2011
STATUS
approved
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Last modified April 24 17:10 EDT 2024. Contains 371962 sequences. (Running on oeis4.)