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a(n+1)^2 is next smallest nontrivial square beginning with a(n)^2, initial square is 9.
3

%I #8 Oct 15 2019 11:57:30

%S 3,31,3101,31010001,3101000100000001,9806223340409913487644162249555,

%T 310100010000000100000000000000014337285304591730671503423653032

%N a(n+1)^2 is next smallest nontrivial square beginning with a(n)^2, initial square is 9.

%C Next terms are 126, 251 and 502 digits long.

%Y Cf. A048561.

%K nonn,base

%O 0,1

%A _Patrick De Geest_, May 15 1999