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a(n) = 1000*log_10(n) rounded to the nearest integer.
2

%I #12 Oct 25 2023 07:41:58

%S 0,301,477,602,699,778,845,903,954,1000,1041,1079,1114,1146,1176,1204,

%T 1230,1255,1279,1301,1322,1342,1362,1380,1398,1415,1431,1447,1462,

%U 1477,1491,1505,1519,1531,1544

%N a(n) = 1000*log_10(n) rounded to the nearest integer.

%Y Cf. A004225, A004227.

%Y Cf. A004220, A004223, A004229.

%K nonn

%O 1,2

%A _N. J. A. Sloane_