A205521 Numbers n such that 4*11^n - 1 is prime.

1, 3, 7, 13, 25, 243, 349, 3645, 10245, 40647, 40749

Offset

1,2

Links

Table of n, a(n) for n=1..11.

Mathematica

Table[If[PrimeQ[4*11^n-1], Print[n]; n], {n, 1, 20000}]

Prog

(PARI) is(n)=ispseudoprime(4*11^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A199020 (4*11^n-1).

Cf. A120378 (numbers n such that 2*11^n - 1 is prime).

Cf. A046865 (numbers n such that 4*5^n - 1 is prime).

Cf. A005540 (numbers n such that 4*3^n - 1 is prime).

Sequence in context: A099810 A283177 A284297 * A125898 A146928 A068673

Adjacent sequences: A205518 A205519 A205520 * A205522 A205523 A205524

Keyword

nonn

Author

José María Grau Ribas, Jan 28 2012

Extensions

a(10)-a(11) from Dmitry Khomovsky, Aug 30 2017

Status

approved