%I #4 Mar 23 2013 05:10:18
%S 1015,11165,102515,112665,1016015,1127665,10151015,10252515,11176165,
%T 11277665,101501015,102617515,111661165,112777665,1015001015,
%U 1016016015,1025252515,1026267515,1116511165,1117526165,1126762665,1127777665
%N Numbers n, written in base 8, with the property that if the base-8 representation of n is read backwards, the result is 5*n.
%C For the decimal representations of these numbers, see A217742.
%C Theorem: There are 2^{floor(d/2)-2} terms with d base-8 digits.
%e 1015 reversed is 5101 = 5*1015 (calculating in base 8).
%Y Cf. A214927, A217742.
%K nonn,base
%O 1,1
%A _N. J. A. Sloane_, Mar 23 2013