A273551 Primes of the form 2^(2^n) + 253.

257, 269, 509, 65789, 4294967549

Offset

1,1

Comments

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

Next term >= 2^2^25 + 253. - Charles R Greathouse IV, Jun 07 2016

Links

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

Mathematica

Select[Table[2^(2^n) + 253, {n, 0, 15}], PrimeQ]

Prog

(Magma) [a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+253];
(PARI) for(n=1, 5, if(ispseudoprime(t=2^2^n+253), print1(t", "))) \\ Charles R Greathouse IV, Jun 08 2016

Crossrefs

Cf. similar sequences listed in A273547.

Sequence in context: A045030 A253149 A139653 * A288411 A060879 A062382

Adjacent sequences: A273548 A273549 A273550 * A273552 A273553 A273554

Keyword

nonn

Author

Vincenzo Librandi, Jun 01 2016

Status

approved