id:A117229 - OEIS Search Results

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Number of perfect powers A001597 seen in the base 10 representation of n.

+0
1

1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 1, 1, 1, 2, 2, 3, 3, 2, 2, 3 (list; graph; listen)

	OFFSET	`0,11`
	COMMENT	`If n is a perfect power a(n)=1.`
	CROSSREFS	`Sequence in context: A072550 A037810 A038769 this_sequence A075661 A060709 A035222` `Adjacent sequences: A117226 A117227 A117228 this_sequence A117230 A117231 A117232`
	KEYWORD	`base,easy,nonn,obsc`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Apr 22 2006`
	EXTENSIONS	`Exactly how is this defined? Why isn't a(16) = 2, from the perfect powers 1 and 16? - njas, Apr 09 2008`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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