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Consider the first run of composites that contains at least two numbers whose largest prime factor is prime(n), n >= 2. a(n) is the second of these numbers.

+0
2

27, 125, 147, 539, 2197, 2992, 3249, 50255, 11774, 15717, 62271, 265680, 172000, 34122, 1133458, 2313744, 1060851, 332387, 1334232, 404931, 1388583, 1357299, 15800793, 5516390, 66896138, 11962935, 6085090, 129761884, 43216624, 90972640 (list; graph; listen)

	OFFSET	`2,1`
	COMMENT	`For comments, examples and programs see sequence A137799, which gives the first of these numbers.`
	CROSSREFS	`Cf. A137799.` `Sequence in context: A087795 A036927 A145555 this_sequence A125497 A118092 A126272` `Adjacent sequences: A137797 A137798 A137799 this_sequence A137801 A137802 A137803`
	KEYWORD	`nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Feb 11 2008`
	EXTENSIONS	`Edited and a(18) through a(31) added by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Feb 15 2008`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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