id:A113978 - OEIS Search Results

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a(n)=Sum(d|n)(10^(n-d)).

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1, 11, 101, 1101, 10001, 111001, 1000001, 11010001, 101000001, 1100100001, 10000000001, 111101000001, 1000000000001, 11000010000001, 101010000000001, 1101000100000001, 10000000000000001, 111001001000000001 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`A074854 in base 2. Stacking the elements gives the triangle A051731.`
	FORMULA	`G.f.: Sum_{k>0} 10^(k-1)x^k/(1-10^(k-1)x^k).`
	PROGRAM	`(PARI) a(n)=if(n<1, 0, 10^npolcoeff(sum(k=1, n, 10/(10-x^k), xO(x^n)), n))`
	CROSSREFS	`Sequence in context: A089183 A113999 A068166 this_sequence A006943 A073030 A097649` `Adjacent sequences: A113975 A113976 A113977 this_sequence A113979 A113980 A113981`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 11 2005`

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

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