id:A046462 - OEIS Search Results

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Concatenation of numbers from 1 to a(n) has exactly 3 prime factors, with multiplicity.

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2, 5, 10, 13, 14, 15, 31, 51, 61 (list; graph; listen)

	OFFSET	`0,1`
	LINKS	`P. De Geest, Normal Smarandache Concatenated Numbers, Prime factors from 1 up to n` `C. Rivera, Primes by Listing` `M. Fleuren, Factors and primes of Smarandache sequences.`
	CROSSREFS	`Cf. A046460.` `Sequence in context: A018288 A080792 A090050 this_sequence A099261 A103215 A037942` `Adjacent sequences: A046459 A046460 A046461 this_sequence A046463 A046464 A046465`
	KEYWORD	`nonn,hard,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1998.`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.