id:A102642 - OEIS Search Results

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a(n)=A102640(n)+A102641(n)-1.

+0
5

2, 3, 5, 5, 4, 5, 3, 4, 4, 5, 3, 7, 3, 6, 3, 3, 4, 6, 3, 6, 4, 7, 3, 6, 3, 5, 3, 5, 4, 7, 3, 5, 4, 5, 5, 7, 3, 6, 5, 5, 3, 6, 3, 6, 5, 5, 3, 7, 3, 5, 4, 5, 3, 6, 7, 3, 6, 3, 3, 4, 3, 5, 4, 3, 4, 6, 3, 5, 5, 6, 3, 7, 3, 5, 7, 5, 5, 6, 3, 5, 6, 5, 3, 4, 3, 5, 3, 6, 3, 5, 3, 5, 4, 5, 5, 5, 4, 6, 4, 7, 3, 6, 3, 4, 7 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A006530(2^n)=2 is a local minimum. Actual sequence displays the "width of valley" between the two nearest peaks of largest prime divisors. At the bottom of valley lays the number 2, the minimum.`
	EXAMPLE	`n=12: 2^10=4096. The greatest prime divisors of numbers around 4096 [both downward and upward] are as follows: {31, 4093, 89, 13, 2, 241, 683, 4099, 41}. The length of relevant sequence, i.e. between peaks 4093 and 4099 is 7, thus a(12)=7.`
	CROSSREFS	`Cf. A006530, A102640, A102641, A102643, A102644.` `Adjacent sequences: A102639 A102640 A102641 this_sequence A102643 A102644 A102645` `Sequence in context: A133293 A096289 A131295 this_sequence A133304 A003660 A111164`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jan 21 2005`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

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