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A059077
Numbers k such that 2*7^k  3 is prime.
0
1, 3, 4, 7, 132, 253, 9040, 21888
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OFFSET
1,2
COMMENTS
a(9) > 27376. 
Jinyuan Wang
, Dec 21 2019
LINKS
Table of n, a(n) for n=1..8.
MATHEMATICA
Do[ If[ PrimeQ[ 2*7^n  3 ], Print[n] ], {n, 1, 6000} ]
PROG
(PARI) is(n)=ispseudoprime(2*7^n3) \\
Charles R Greathouse IV
, Jun 13 2017
CROSSREFS
Cf.
A059041
(3*7^k+2 is prime).
Sequence in context:
A042543
A041987
A100978
*
A042707
A229348
A215758
Adjacent sequences:
A059074
A059075
A059076
*
A059078
A059079
A059080
KEYWORD
nonn
,
more
AUTHOR
Robert G. Wilson v
, Feb 12 2001
EXTENSIONS
a(7)a(8) from
Jinyuan Wang
, Dec 21 2019
STATUS
approved
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Last modified May 27 23:16 EDT 2024. Contains 372900 sequences. (Running on oeis4.)