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%I #6 Jul 15 2021 09:12:48
%S 1,4,9,89,889,8889,88889,888889,8888889,88888889,888888889,1026765584,
%T 1066636289,1107266436,1148656025,1190805056,1233713529,1277381444,
%U 1321808801,1366995600,1412941841,1459647524,1507112649,1555337216
%N Numbers k such that the concatenation of 8*k with k gives a square.
%e 8_1 = 9^2.
%Y Cf. A102567, A106497, A115527 - A115556.
%K nonn,base
%O 1,2
%A _Giovanni Resta_, Jan 25 2006
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