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Fractional part of square root of a(n) starts with digit 4.
1

%I #11 Sep 03 2020 09:45:00

%S 2,6,12,20,30,41,42,55,56,71,72,89,90,109,110,130,131,132,154,155,156,

%T 180,181,182,208,209,210,238,239,240,269,270,271,272,303,304,305,306,

%U 339,340,341,342,377,378,379,380,417,418,419,420,458,459,460,461,462

%N Fractional part of square root of a(n) starts with digit 4.

%t Select[Range[500],Mod[Floor[10*Sqrt[#]],10]==4&] (* _Harvey P. Dale_, Oct 21 2016 *)

%Y Cf. A034110.

%K nonn,easy,base

%O 1,1

%A _Patrick De Geest_, Sep 15 1998