id:A048547 - OEIS Search Results

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a(n)*(a(n)+1) is smallest pronic number containing exactly n 9's.

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9, 31, 890, 2234, 14131, 30331, 173031, 969520, 9958890, 31617890, 360542549, 547631234 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Eric Weisstein's World of Mathematics, Pronic Number`
	CROSSREFS	`Cf. A048548, A002378.` `Sequence in context: A140323 A145950 A159279 this_sequence A141573 A075433 A018833` `Adjacent sequences: A048544 A048545 A048546 this_sequence A048548 A048549 A048550`
	KEYWORD	`nonn,base,more`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), May 15 1999.`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.