A273809 - OEIS

%I #7 Sep 08 2022 08:46:17

%S 491,503,743,4294967783,

%T 115792089237316195423570985008687907853269984665640564039457584007913129640423

%N Primes of the form 2^(2^n) + 487.

%C Terms given correspond to n = 1, 2, 3, 5 and 8.

%C Next term >= 2^2^35 + 487. - _Charles R Greathouse IV_, Jun 07 2016

%t Select[Table[2^(2^n) + 487, {n, 0, 15}], PrimeQ]

%o (Magma) [a: n in [0..16] | IsPrime(a) where a is 2^(2^n)+487];

%o (PARI) for(n=0,8, if(ispseudoprime(t=2^2^n+357), print1(t", "))) \\ _Charles R Greathouse IV_, Jun 07 2016

%Y Cf. similar sequences listed in A273547.

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Jun 03 2016