A102442 - OEIS

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A102442

Number of iterations needed to transform n by A102440 into a 3-smooth number.

0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 2, 0, 2, 1, 1, 0, 2, 0, 2, 1, 1, 2, 3, 0, 1, 2, 0, 1, 3, 1, 3, 0, 2, 2, 1, 0, 2, 2, 2, 1, 3, 1, 3, 2, 1, 3, 4, 0, 1, 1, 2, 2, 3, 0, 2, 1, 2, 3, 4, 1, 4, 3, 1, 0, 2, 2, 3, 2, 3, 1, 4, 0, 4, 2, 1, 2, 2, 2, 3, 1, 0, 3, 4, 1, 2, 3, 3, 2, 4, 1, 2, 3, 3, 4, 2, 0, 3, 1, 2, 1, 3, 2, 3, 2, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,11`
	COMMENTS	`a(n) = 0 iff n is 3-smooth (A003586);` `a(A102444(n))=n and a(m)<n for m<a(A102444(n)).`
	EXAMPLE	`A102440(A102440(A102440(41)))=24 and A102440(24)=24:` `41 -> 313 -> 3[13->25]=235 -> 23[5->22]=3*2^3=24,` `therefore a(41)=3, A102443(41)=24.`
	CROSSREFS	`Sequence in context: A060950 A039976 A133701 * A091182 A001822 A112553` `Adjacent sequences: A102439 A102440 A102441 * A102443 A102444 A102445`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 09 2005`

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Last modified February 16 18:54 EST 2012. Contains 205939 sequences.