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%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