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%I #6 Jul 15 2021 09:13:53
%S 18,36,168,252,336,1668,3336,16668,33336,166668,333336,1666668,
%T 3333336,16666668,22222224,27777780,33333336,113149848,114678900,
%U 116207952,117737004,119266056,120795108,122324160,123853212
%N Numbers k such that k^2 is the concatenation of two numbers m and 8*m.
%e 18^2 = 3_24.
%Y Cf. A102567, A106497, A115527 - A115556.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Jan 25 2006
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