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A056800
Numbers n such that 6*9^n +1 is prime.
1
0, 2, 4, 8, 28, 32, 448, 2108, 3112, 76264
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OFFSET
1,2
COMMENTS
a(11) > 10^5. -
Robert Price
, Jun 04 2015
LINKS
Table of n, a(n) for n=1..10.
MATHEMATICA
Do[If[PrimeQ[6*9^n + 1], Print[n]], {n, 0, 1000}]
Select[Range[3000], PrimeQ[6 9^# + 1] &] (*
Vincenzo Librandi
, Sep 28 2012 *)
PROG
(PARI) is(n)=ispseudoprime(6*9^n+1) \\
Charles R Greathouse IV
, Jun 12 2017
CROSSREFS
Sequence in context:
A006399
A326293
A324328
*
A302915
A259135
A219969
Adjacent sequences:
A056797
A056798
A056799
*
A056801
A056802
A056803
KEYWORD
nonn
AUTHOR
Robert G. Wilson v
, Aug 22 2000
EXTENSIONS
a(8) from
Vincenzo Librandi
, Sep 28 2012
a(9)-a(10) from
Robert Price
, Jun 04 2015
STATUS
approved
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Last modified April 18 20:26 EDT 2024. Contains 371781 sequences. (Running on oeis4.)