OFFSET
1,3
COMMENTS
Primes: 3, 5, 19, 247811, 2030043139, 1759218604441603,...
EXAMPLE
2 is in this sequence because 2^2*2^2 + 3 = 19 and 19 is prime.
MATHEMATICA
Select[Range[0, 10000], PrimeQ[#^2 2^# + 3] &] (* Vincenzo Librandi, Jun 25 2015 *)
PROG
(Magma) [n: n in [0..1000] | IsPrime(n^2*2^n+3)];
(PARI) is(n)=ispseudoprime(n^2*2^n+3) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Juri-Stepan Gerasimov, Jun 23 2015
EXTENSIONS
More terms from Vincenzo Librandi, Jun 25 2015
a(18)-a(22) from Jinyuan Wang, May 15 2020
a(23) from Michael S. Branicky, Apr 20 2023
a(24) from Michael S. Branicky, Jul 23 2024
STATUS
approved