%I #29 Apr 09 2016 16:07:45
%S 2,3,4,5,8,16,27,28,33,36,48,66,90,112,508,1036,1041,1560,2208,2668,
%T 4388,6097,6517,11353,17284,22385,24740,29805,77188,135219,199237
%N Exponents n such that 2^(2*n+1) - 3*2^n - 1 (A195461) is prime
%C Obtained using a Lucas-Lehmer-type test due to Williams.
%C Next term > 200000.
%H H. C. Williams, <a href="http://projecteuclid.org/euclid.pjm/1102734270">A class of primality tests for trinomials which includes the Lucas-Lehmer test</a>, Pacific J. Math. Volume 98, Number 2 (1982), 477-494.
%o (PARI) for(n=1,10^9,if(ispseudoprime(2^(2*n+1) - 3*2^n - 1),print1(n,", "))); \\ _Joerg Arndt_, Apr 08 2016
%Y Cf. A195461.
%K nonn,more
%O 1,1
%A _Fabrice Lavier_, Jan 03 2016