A141774 Numbers n such that 2*11^n + 1 is prime.

0, 1, 3, 9, 43, 79, 175, 11325, 13359, 18577

Offset

1,3

Comments

a(11) > 2*10^5. - Robert Price, Oct 16 2015

Links

Table of n, a(n) for n=1..10.

Mathematica

Join[{0}, Select[Range[1, 175, 2], PrimeQ[2*11^# + 1] &]] (* Arkadiusz Wesolowski, Nov 06 2012 *)

Prog

(PARI) for(n=0, 1e5, if(isprime(2*11^n + 1), print1(n", "))) \\ Altug Alkan, Oct 16 2015

Crossrefs

Cf. A141798, A190942, A068231.

Sequence in context: A013562 A081681 A281940 * A141349 A018427 A275781

Adjacent sequences: A141771 A141772 A141773 * A141775 A141776 A141777

Keyword

hard,nonn

Author

Rick L. Shepherd, Jul 03 2008

Extensions

a(8)-a(10) from Arkadiusz Wesolowski, Nov 06 2012

Status

approved