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%I #14 Aug 29 2022 05:31:10
%S 1,3,11,7,17,41,37,83,79,109,241,239,499,491,1117,1109,2539,2531,5623,
%T 5591,11471,11467,23369,23357
%N Even terms in A354790, divided by 2, in order of appearance.
%C The even terms in A354790 appear at indices 2, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, ... and conjecturally at indices 2^k-1 for all k >= 3.
%Y Cf. A354790, A355896.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Aug 27 2022
%E a(16)-a(24) from _Rémy Sigrist_, Aug 29 2022