id:A100758 - OEIS Search Results

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Greatest prime factor of the concatenation of terms of the n-th row of the triangle formed by the Stirling number of the second kind.

+0
2

11, 131, 587, 1646443, 6827, 18011869, 9120065483, 363724245921599, 975761724248252813688864599, 17542508725666616033, 111131968773953028264114836512440131291369683 (list; graph; listen)

	OFFSET	`2,1`
	COMMENT	`Are these concatenations squarefree?`
	FORMULA	`a(n) = A006530[A061113(n)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2007`
	EXAMPLE	`a(4) = 587 is the greatest prime factor of 1761 =3*587.`
	CROSSREFS	`Cf. A100755, A100756, A100757, A008277.` `Sequence in context: A099677 A142187 A140004 this_sequence A083763 A076255 A076357` `Adjacent sequences: A100755 A100756 A100757 this_sequence A100759 A100760 A100761`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 23 2004`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2007`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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