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%I #11 Jul 15 2021 09:11:27
%S 1836734693877551020408163265306122449,
%T 7346938775510204081632653061224489796,
%U 15311909262759924385633270321361058601134215500945179584121,27221172022684310018903591682419659735349716446124763705104
%N Numbers k such that the concatenation of 9*k with k gives a square.
%Y Cf. A102567, A106497, A115527 - A115556.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Jan 25 2006
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