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a(1) = 6; 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 #7 Sep 17 2023 21:31:52

%S 6,44,2456,1247544,214842502456,29945373749998752456,

%T 7489739829907193749999999785157497544,

%U 2122105977711165946126545050684497624999999999999999970054626250001247544

%N a(1) = 6; 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.

%Y Cf. A050635, A065690, A065782, A065784.

%K base,nonn

%O 1,1

%A _Klaus Brockhaus_, Nov 19 2001

%E More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001