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a(1) = 9; for n > 1, a(n) is the square root of the smallest square > a(n-1)^2 with a(n-1)^2 forming its final digits.
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%I #5 Sep 17 2023 21:36:10

%S 9,41,1209,469959,176270001209,6042408942999999530041,

%T 16385871165869048127200000000000176270001209,

%U 28444329561227422116741433513058707457037799999999999999999999993957591057000000469959

%N a(1) = 9; for n > 1, a(n) is the square root of the smallest square > a(n-1)^2 with a(n-1)^2 forming its final digits.

%C a(n) = A050635(n+1) for n >= 1; a(n) = sqrt(A065791(n)).

%Y Cf. A050635, A065690, A065791, A065793.

%K base,nonn

%O 1,1

%A _Klaus Brockhaus_, Nov 19 2001