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%I #20 Apr 08 2021 07:18:18
%S 6,8,12,16,18,20,24,36,40,42,48,54,60,64,72,80,84,96,100,108,120,126,
%T 128,136,144,156,160,162,168,180,192,200,216,220,240,252,256,272,288,
%U 294,300,312,320,324,336,342,360,378,384,400,408,420,432,440,468,480,486
%N Numbers k such that 4^k - 2^k + 1 is a strong pseudoprime to base 2 (A001262).
%C Apparently this sequence is A068563 \ {1, 2, 4, 32}. - _Amiram Eldar_, Oct 23 2020
%Y Cf. A001262, A068563.
%K nonn
%O 1,1
%A _Davide Rotondo_, Oct 23 2020
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