1,2

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

(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

Cf. A173168.

Sequence in context: A269571 A281493 A181341 * A298424 A008812 A144679

Adjacent sequences: A174178 A174179 A174180 * A174182 A174183 A174184

nonn

Vincenzo Librandi, Mar 11 2010

approved