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URL: https://oeis.org/A057871

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A057871
Numbers k such that 3*13^k + 2 is prime.
1
0, 1, 2, 22, 25, 35, 49, 95, 105, 107, 302, 351, 1907, 3435, 5051, 6885
OFFSET
1,3
COMMENTS
a(17) > 10000. - Jinyuan Wang, Feb 02 2020
a(17) > 40000. - Michael S. Branicky, Jul 10 2024
MATHEMATICA
Do[ If[ PrimeQ[ 3*13^n + 2 ], Print[ n ] ], {n, 0, 1500} ]
Select[Range[0, 4000], PrimeQ[(3*13^# + 2)] &] (* Vincenzo Librandi, Sep 28 2012 *)
PROG
(PARI) is(n)=ispseudoprime(3*13^n+2) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Cf. A058025 (3*13^k - 2 is prime).
Sequence in context: A393717 A111751 A037416 * A152243 A074160 A368406
KEYWORD
nonn,more
AUTHOR
Robert G. Wilson v, Nov 15 2000
EXTENSIONS
a(13)-a(14) from Vincenzo Librandi, Sep 28 2012
a(15)-a(16) from Jinyuan Wang, Feb 02 2020
STATUS
approved