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A077429 a(n) = floor(log_10(n^2)). 1

%I #11 Sep 17 2020 13:25:23

%S 0,0,0,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,

%T 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,

%U 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4

%N a(n) = floor(log_10(n^2)).

%C a(n) = A004216(n^2).

%t Table[Floor[Log10[n^2]],{n,120}] (* _Harvey P. Dale_, Sep 17 2020 *)

%Y Cf. A004216, A077430.

%K nonn

%O 1,10

%A _Reinhard Zumkeller_, Nov 05 2002

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