A162715 Primes of the form 3^p-2^(p+1), where p is also a prime.

11, 179, 1931, 617669101316651, 14130386090585813000157964091, 19088056323407826758511836230558252318494847619

Offset

1,1

Comments

The next term has 1117 digits and is not included explicitly for that reason.

Links

Table of n, a(n) for n=1..6.

Formula

a(n) = 3^A162714(n)-2^(1+A162714(n)) .

Mathematica

Select[Table[3^p - 2^(p + 1), {p, Prime[Range[70]]}], PrimeQ] (* Vincenzo Librandi, Sep 11 2013 *)

Prog

(Magma) [a: p in PrimesInInterval(3, 1200) | IsPrime(a) where a is 3^p - 2^(p + 1)]; // Vincenzo Librandi, Sep 11 2013

Crossrefs

Cf. A162714.

Sequence in context: A101791 A140034 A363024 * A131638 A157382 A174979

Adjacent sequences: A162712 A162713 A162714 * A162716 A162717 A162718

Keyword

nonn

Author

Vincenzo Librandi, Jul 11 2009

Extensions

Clarified status of p in the definition - R. J. Mathar, Oct 16 2009

Status

approved