0,1

a(n)>=1 because between n and (n+1)^2 there is always at least one cubic number.

a(6)=2 because between 5 and 6^2 there are two cubic numbers: 8 and 27

Table of n, a(n) for n=0..84.

f[n_] := Floor[(n + 1)^(2/3)] - Floor[n^(1/3)] + If[ IntegerQ[n^(1/3)], 1, 0]; Table[ f[n], {n, 0, 84}] (* Robert G. Wilson v, Apr 24 2005 *)

Sequence in context: A237706 A064823 A140225 * A143227 A329746 A302247

Adjacent sequences: A104755 A104756 A104757 * A104759 A104760 A104761

easy,nonn

Giovanni Teofilatto, Apr 23 2005

More terms from Robert G. Wilson v, Apr 24 2005

approved