A046462 - OEIS

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A046462

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

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

	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: A182656 A090050 A192539 * A188025 A187949 A180161` `Adjacent sequences: A046459 A046460 A046461 * A046463 A046464 A046465`
	KEYWORD	`nonn,hard,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1998.`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.