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 A100196 Numbers of positive integer cubes <= n^2. 4
 1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 18, 18, 18 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS FORMULA a(n) = floor(n^(2/3)). [Charles R Greathouse IV, Mar 21 2012] MATHEMATICA Table[ Floor[n^(2/3)], {n, 120}] (* Ray Chandler *) PROG (PARI) a(n)=floor(sqrtn(n, 3)) \\ Charles R Greathouse IV, Mar 21 2012 (PARI) a(n)=(n^2+.5)^(1/3)\1 \\ More careful rounding. -Charles R Greathouse IV, Mar 21 2012 CROSSREFS Cf. A100197. Sequence in context: A036468 A028829 A130855 * A094708 A039730 A152595 Adjacent sequences:  A100193 A100194 A100195 * A100197 A100198 A100199 KEYWORD easy,nonn AUTHOR Giovanni Teofilatto, Dec 27 2004 EXTENSIONS Corrected and extended by Ray Chandler, Jan 09 2005 STATUS approved

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