A102690 - OEIS

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A102690

Number of n-expodigital numbers (i.e. numbers m such that m^n has exactly n decimal digits).

10, 6, 5, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(n)=10 - A102691(n).`
	EXAMPLE	`a(6)=3 because only the 3 numbers 7,8 and 9 are 6-expodigital:7^6=117649; 8^=262144; 9^6=531441.`
	CROSSREFS	`Cf. A102691.` `Sequence in context: A006518 A193952 A158508 * A076366 A105155 A072930` `Adjacent sequences: A102687 A102688 A102689 * A102691 A102692 A102693`
	KEYWORD	`fini,full,nonn,base`
	AUTHOR	`Lekraj Beedassy (blekraj(AT)yahoo.com), Jan 21 2005`
	EXTENSIONS	`Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Aug 03 2010`

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Last modified February 15 05:26 EST 2012. Contains 205694 sequences.