OFFSET
1,2
COMMENTS
a(36) > 11800. - Jinyuan Wang, Mar 19 2020
EXAMPLE
2^3 + 2^1 + 1 = 11 prime so a(1) = 1.
2^5 + 2^2 + 1 = 37 prime so a(2) = 2.
2^7 + 2^3 + 1 = 137 prime so a(3) = 3.
PROG
(PARI) is(n)=ispseudoprime(2^(2*n+1)+2^n+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Pierre CAMI, Apr 11 2005
EXTENSIONS
a(34)-a(35) from Jinyuan Wang, Mar 19 2020
a(36)-a(41) from Jeppe Stig Nielsen, Jun 16 2020
a(42)-a(44) from Jorge Coveiro, Apr 10 2023
STATUS
approved