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A109076 Numbers n such that 11^n + 2 is prime. 10
0, 1, 5, 9, 287, 8273, 121185 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

No further terms < 100000. - Ray Chandler, Jul 30 2011

a(8) > 2*10^5. - Robert Price, May 11 2014

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

11^5 + 2 = 161053 is prime, hence 5 is a term.

MATHEMATICA

Do[If[PrimeQ[11^n + 2], Print[n]], {n, 0, 5000}]

PROG

(PARI) is(n)=isprime(11^n+2) \\ Charles R Greathouse IV, Feb 17 2017

CROSSREFS

Sequence in context: A002657 A046093 A097086 * A101683 A098135 A112259

Adjacent sequences:  A109073 A109074 A109075 * A109077 A109078 A109079

KEYWORD

more,nonn

AUTHOR

Ryan Propper, Jun 17 2005

EXTENSIONS

8273 from Jason Earls (zevi_35711(AT)yahoo.com), Feb 29 2008

Edited by N. J. A. Sloane, Mar 02 2008

a(7) from Robert Price, May 11 2014

STATUS

approved

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Last modified December 13 19:20 EST 2017. Contains 295976 sequences.