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a(n) = ceiling(sqrt(n) + n^(1/3)).
0

%I #10 Jul 31 2018 16:00:08

%S 2,3,4,4,4,5,5,5,6,6,6,6,6,7,7,7,7,7,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,

%T 10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,

%U 12,12,12,12,12,12,12,13,13

%N a(n) = ceiling(sqrt(n) + n^(1/3)).

%t Table[Ceiling[Sqrt[n]+Surd[n,3]],{n,70}] (* _Harvey P. Dale_, Jul 31 2018 *)

%Y Cf. A000196, A003059, A134914, A134915, A134916.

%K nonn

%O 1,1

%A _Mohammad K. Azarian_, Nov 18 2007