A273807 Primes of the form 2^(2^n) + 427.

431, 443, 683, 65963, 4294967723

Offset

1,1

Comments

Terms given correspond to n = 1, 2, 3, 4 and 5.

Next term >= 2^2^27 + 427. - Charles R Greathouse IV, Jun 07 2016

Links

Table of n, a(n) for n=1..5.

Mathematica

Select[Table[2^(2^n) + 427, {n, 0, 15}], PrimeQ]

Prog

(Magma) [a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+427];
(PARI) for(n=1, 5, if(ispseudoprime(t=2^2^n+427), print1(t", "))) \\ Charles R Greathouse IV, Jun 07 2016

Crossrefs

Cf. similar sequences listed in A273547.

Sequence in context: A208627 A176387 A160518 * A323047 A046018 A142802

Adjacent sequences: A273804 A273805 A273806 * A273808 A273809 A273810

Keyword

nonn

Author

Vincenzo Librandi, Jun 02 2016

Status

approved