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A018005 Smallest number whose cube has n digits. 6
1, 3, 5, 10, 22, 47, 100, 216, 465, 1000, 2155, 4642, 10000, 21545, 46416, 100000, 215444, 464159, 1000000, 2154435, 4641589, 10000000, 21544347, 46415889, 100000000, 215443470, 464158884, 1000000000, 2154434691, 4641588834 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

Powers of cube root of 10 rounded up.

EXAMPLE

a(5) = 22, 22^3 = 10648 has 5 digits, while 21^3 = 9261 has 4 digits.

CROSSREFS

Cf. A061434, A061439.

Sequence in context: A018107 A053709 A102772 * A080522 A173232 A132332

Adjacent sequences:  A018002 A018003 A018004 * A018006 A018007 A018008

KEYWORD

nonn,base,easy

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), May 16 2001

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Last modified February 17 03:29 EST 2012. Contains 205978 sequences.