id:A102442 - OEIS Search Results

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

+0
5

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; listen)

	OFFSET	`1,11`
	COMMENT	`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 this_sequence A091182 A001822 A112553` `Adjacent sequences: A102439 A102440 A102441 this_sequence A102443 A102444 A102445`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 09 2005`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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