id:A133486 - OEIS Search Results

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a(n) = Sum_{ k = 0 to n-1} ( subtract k modulo 9 from 9, multiply this by kth power of 10 ).

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9, 89, 789, 6789, 56789, 456789, 3456789, 23456789, 123456789, 9123456789, 89123456789, 789123456789 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = sum(0 to n-1, ((9-(k % 9))*10^k) )`
	EXAMPLE	`a(6) = 9+80+700+6000+50000+400000 = 456789`
	CROSSREFS	`Sequence in context: A055410 A111918 A064616 this_sequence A015584 A072256 A138288` `Adjacent sequences: A133483 A133484 A133485 this_sequence A133487 A133488 A133489`
	KEYWORD	`nonn`
	AUTHOR	`Prashant Garg (prashant.garg1988(AT)yahoo.com), Nov 30 2007`

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