A129251 - OEIS

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A129251

Number of distinct prime factors p of n such that p^p is a divisor of n.

0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Average value is A094289 = 0.28735...; attains record values on A076265, in particular a(A076265(n)) = n.` `a(A048103(n)) = 0, a(A100716(n)) > 0.`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000`
	CROSSREFS	`Cf. A129252, A001221, A051674.` `Sequence in context: A157228 A105563 A011765 * A144602 A160351 A023969` `Adjacent sequences: A129248 A129249 A129250 * A129252 A129253 A129254`
	KEYWORD	`nonn,easy`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 07 2007`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.