A274022 Primes of the form 2^(2^n) + 3.

5, 7, 19, 65539

Offset

1,1

Comments

Terms given correspond to n = 0, 1, 2, and 4.

Next term >= 2^2^28 + 3. - Charles R Greathouse IV, Jun 08 2016

Links

Table of n, a(n) for n=1..4.

Mathematica

Select[Table[2^(2^n) + 3, {n, 0, 15}], PrimeQ]

Prog

(Magma) [a: n in [0..10] | IsPrime(a) where a is 2^(2^n)+3];
(PARI) for(n=0, 4, if(ispseudoprime(t=2^2^n+3), print1(t", "))) \\ Charles R Greathouse IV, Jun 08 2016

Crossrefs

Cf. A019434, A130730.

Cf. similar sequences listed in A273547.

Sequence in context: A231865 A130729 A222411 * A117321 A279252 A279957

Adjacent sequences: A274019 A274020 A274021 * A274023 A274024 A274025

Keyword

nonn

Author

Vincenzo Librandi, Jun 07 2016

Status

approved