A174181 Numbers n such that 2^n+2*n-1 is prime.

1, 2, 3, 4, 5, 8, 11, 14, 15, 27, 41, 50, 51, 111, 143, 171, 316, 350, 503, 843

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Mathematica

Select[Range[850], PrimeQ[2^#+2#-1]&] (* Harvey P. Dale, Jul 26 2021 *)

Prog

(Magma) [n: n in [1..1200] | IsPrime(2^n+2*n-1) ]
(PARI) is(n)=ispseudoprime(2^n+2*n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A173168.

Sequence in context: A269571 A281493 A181341 * A298424 A008812 A343608

Adjacent sequences: A174178 A174179 A174180 * A174182 A174183 A174184

Keyword

nonn

Author

Vincenzo Librandi, Mar 11 2010

Status

approved