OFFSET
1,2
COMMENTS
a(2)=2 because there is no integer with cube between 10 and 19.
A generalization to arbitrary powers is found in Hürlimann, 2004.
LINKS
W. Hürlimann, Integer powers and Benford's law, International Journal of Pure and Applied Mathematics, vol. 11, no. 1, pp. 39-46, 2004.
FORMULA
a(n) = floor((10^n/5)^(1/3)).
MATHEMATICA
Floor[Power[(10^Range[30])/5, (3)^-1]] (* Harvey P. Dale, Jul 15 2011 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Werner S. Hürlimann (whurlimann(AT)bluewin.ch), Jun 05 2003
EXTENSIONS
Edited by Don Reble, Nov 05 2005
STATUS
approved