A104058 - OEIS

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A104058

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

1

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, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 15, 15, 15, 15, 15, 15

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..69.

FORMULA

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

CROSSREFS

Sequence in context: A088650 A097154 A108421 * A132345 A178976 A352426

Adjacent sequences: A104055 A104056 A104057 * A104059 A104060 A104061

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Mar 02 2005

EXTENSIONS

Better definition from Emeric Deutsch, Mar 25 2005

STATUS

approved