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A331589 a(n) is the greatest k such that A331587(n) = k * reverse(k) (where reverse(k) is the binary reversal of k, A030101(k)).

%I A331589 #10 Jan 22 2020 12:57:20
%S A331589 1,3,5,7,9,13,15,17,21,25,29,27,31,33,41,49,45,57,53,51,61,59,63,65,
%T A331589 73,81,97,89,85,105,113,101,93,121,99,109,117,107,115,125,123,119,127,
%U A331589 129,145,161,153,177,169,193,165,185,209,201,225,181,197,217,241
%N A331589 a(n) is the greatest k such that A331587(n) = k * reverse(k) (where reverse(k) is the binary reversal of k, A030101(k)).
%H A331589 Rémy Sigrist, <a href="/A331589/b331589.txt">Table of n, a(n) for n = 1..8347</a>
%H A331589 Rémy Sigrist, <a href="/A331589/a331589.gp.txt">PARI program for A331589</a>
%F A331589 a(n) = A030101(A331588(n)).
%F A331589 a(n) * A331588(n) = A331587(n).
%o A331589 (PARI) See Links section.
%Y A331589 Cf. A030101, A331587, A331588.
%K A331589 nonn,base
%O A331589 1,2
%A A331589 _Rémy Sigrist_, Jan 21 2020