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%I #8 Jul 17 2021 01:45:17
%S 63565788,777035126,785900449264170834,824735400720481514,
%T 41969556121016094021,7841042904081599033746826,
%U 775474811976872476373043200886
%N Numbers k such that the base-10 representation of k^2 has the structure dmmd, where d is a single digit and m is a string of digits.
%C a(8) and a(9) have 42 digits. a(8) = 403578381989727694739321538082071713672671.
%e 785900449264170834^2 = 6[17639516153625555][17639516153625555]6.
%Y Cf. A116500, A116501, A305719.
%K base,nonn
%O 1,1
%A _Giovanni Resta_, Feb 18 2006
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