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

431, 443, 683, 65963, 4294967723

Offset: 1

Author

Vincenzo Librandi, Jun 02 2016

Keywords

• nonn

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

Crossrefs

Cf. similar sequences listed in A273547.

Programs

Magma

[a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+427];

Mathematica

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

PARI

for(n=1,5, if(ispseudoprime(t=2^2^n+427), print1(t", "))) \\ Charles R Greathouse IV, Jun 07 2016