%I
%S 0,1,2,3,4,5,8,9,22,23,28,37,49,53,59,74,83,149,183,577,993,1335,1777,
%T 7077,8518,8775,12193,20225
%N Numbers k such that 2*3^k + 5 is prime.
%C a(29) > 20270.  _Jinyuan Wang_, Jan 20 2020
%t Do[ If[ PrimeQ[ 2*3^n + 5 ], Print[ n ] ], {n, 0, 2500} ]
%o (PARI) is(n)=ispseudoprime(2*3^n+5) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y Cf. A057910 (2*3^k  5 is prime).
%K nonn,more
%O 1,3
%A _Robert G. Wilson v_, Nov 16 2000
%E First term 0 inserted by _Georg Fischer_, Aug 01 2019
%E a(24)a(28) from _Jinyuan Wang_, Jan 20 2020
