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Fractional part of cube root of a(n) starts with digit 3.
1

%I #11 Mar 21 2021 19:21:55

%S 13,36,37,38,39,80,81,82,83,84,85,149,150,151,152,153,154,155,156,157,

%T 251,252,253,254,255,256,257,258,259,260,261,262,390,391,392,393,394,

%U 395,396,397,398,399,400,401,402,403,404,405,572,573,574,575,576,577

%N Fractional part of cube root of a(n) starts with digit 3.

%t Select[Range[600],Mod[Floor[10 N[Surd[#,3]]],10]==3&] (* _Harvey P. Dale_, Mar 21 2021 *)

%Y Cf. A034129.

%K nonn,easy,base

%O 1,1

%A _Patrick De Geest_, Sep 15 1998