id:A046463 - OEIS Search Results

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Concatenation of numbers from 1 to a(n) has exactly 4 prime factors, with multiplicity.

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9, 16, 23, 29, 37, 38, 43, 58, 59 (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: A095961 A045911 A134256 this_sequence A003332 A091571 A102219` `Adjacent sequences: A046460 A046461 A046462 this_sequence A046464 A046465 A046466`
	KEYWORD	`nonn,hard,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1998.`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.