A058765 Primes of the form 3^k - 2^k.

5, 19, 211, 129009091, 68629840493971, 617671248800299, 19383245658672820642055731, 14130386091162273752461387579, 1546132562196033990574082188840405015112916155251

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..12

Formula

a(n) = A001047(A057468(n)).

Maple

select(isprime, [seq(3^n - 2^n, n=0..200)]); # Muniru A Asiru, Mar 04 2018

Mathematica

Select[Table[3^n-2^n, {n, 0, 2200}], PrimeQ] (* Vincenzo Librandi, Dec 08 2011 *)

Prog

(Magma) [a: n in [0..300] | IsPrime(a) where a is  3^n - 2^n]; // Vincenzo Librandi, Dec 08 2011
(GAP) Filtered(List([1..200], n->3^n - 2^n), IsPrime); # Muniru A Asiru, Mar 04 2018
(PARI) lista(nn) = for(k=1, nn, if(isprime(p=3^k-2^k), print1(p", "))) \\ Altug Alkan, Mar 04 2018

Crossrefs

Cf. A001047 (3^n-2^n) and A057468 (k such that 3^k-2^k is prime).

Sequence in context: A102262 A123281 A135171 * A317340 A328716 A067967

Adjacent sequences: A058762 A058763 A058764 * A058766 A058767 A058768

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2001

Status

approved