A104058 - OEIS

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A104058

a(n) = |{k^2: 0 <= k^2 <= n}| + |{k^3: 0 <= k^3 <= n}|.

%I #6 Jun 24 2017 16:10:21

%S 2,4,4,4,5,5,5,5,6,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,9,9,10,11,11,11,11,

%T 11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,

%U 13,13,13,13,13,13,13,13,13,15,15,15,15,15,15

%N a(n) = |{k^2: 0 <= k^2 <= n}| + |{k^3: 0 <= k^3 <= n}|.

%F a(n) = 2 + floor(n^(1/2)) + floor(n^(1/3)).

%Y Cf. A104055.

%K nonn

%O 0,1

%A _Giovanni Teofilatto_, Mar 02 2005

%E Better definition from _Emeric Deutsch_, Mar 25 2005