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%I #31 Nov 16 2023 07:44:16
%S 1,2,3,6,8,9,14,15,42,114,195,392,555,852,1004,1185,2001,2030,2031,
%T 2276,8610,8967,10362,11366,15927,16514,17877,19122,19898,27728,29156,
%U 61275,102981,117663,181560,239922,342789,371226,717200,937776,970406,1102722
%N Numbers k such that 4^k + 3 is prime.
%C The halved even terms of A057732. - _R. J. Mathar_, Feb 26 2008
%e 4^15 + 3 = 1073741827 a prime number.
%o (PARI) is(n)=ispseudoprime(4^n+3) \\ _Charles R Greathouse IV_, Feb 20 2017
%Y Cf. A057732, A228026 (the actual primes).
%K nonn,more
%O 1,2
%A Herman H. Rosenfeld (herm3(AT)pacbell.net), Dec 28 2003
%E More terms from _Ray Chandler_, Dec 30 2003
%E More terms from _R. J. Mathar_, Feb 26 2008
%E a(33)-a(37) derived from A057732 by _Robert Price_, Apr 26 2014
%E a(38)-a(42) derived from A057732 by _Amiram Eldar_, Nov 16 2023
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