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A058045
Numbers k such that (5^k + k)/3 is prime.
0
1, 8, 572, 4778, 12884
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OFFSET
1,2
COMMENTS
a(6) > 20065. 
Jinyuan Wang
, Jan 27 2020
LINKS
Table of n, a(n) for n=1..5.
MATHEMATICA
Do[ If[ PrimeQ[ (5^n + n)/3 ], Print[ n ] ], {n, 1, 5000} ]
PROG
(PARI) is(n)=ispseudoprime((5^n+n)/3) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Sequence in context:
A240300
A240432
A275932
*
A086641
A248706
A325292
Adjacent sequences:
A058042
A058043
A058044
*
A058046
A058047
A058048
KEYWORD
nonn
,
more
AUTHOR
Robert G. Wilson v
, Nov 17 2000
EXTENSIONS
a(5) from
Jinyuan Wang
, Jan 27 2020
STATUS
approved
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Last modified June 13 15:51 EDT 2024. Contains 373389 sequences. (Running on oeis4.)