id:A093348 - OEIS Search Results

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A 5-fractal "castle" starting with 0.

+0
8

0, 1, 0, 1, 0, 5, 4, 5, 4, 5, 0, 1, 0, 1, 0, 5, 4, 5, 4, 5, 0, 1, 0, 1, 0, 25, 24, 25, 24, 25, 20, 21, 20, 21, 20, 25, 24, 25, 24, 25, 20, 21, 20, 21, 20, 25, 24, 25, 24, 25, 0, 1, 0, 1, 0, 5, 4, 5, 4, 5, 0, 1, 0, 1, 0, 5, 4, 5, 4, 5, 0, 1, 0, 1, 0, 25, 24, 25, 24, 25, 20, 21, 20, 21, 20, 25, 24 (list; graph; listen)

	OFFSET	`1,6`
	LINKS	`B. Cloitre, Graph of a(n) for n=1 up to 25` `B. Cloitre, Graph of a(n) for n=1 up to 125` `B. Cloitre, Graph of a(n) for n=1 up to 625`
	FORMULA	`a(1)=0 then a(n)=w(n)-a(n-w(n)) where w(n)=5^floor(log(n-1)/log(5))` `a(n) = sum(i=1, n-1, (-1)^(i-1)*5^valuation(i, 5))`
	PROGRAM	`(PARI) a(n)=if(n<2, 0, 5^floor(log(n-1)/log(5))-a(n-5^floor(log(n-1)/log(5))))`
	CROSSREFS	`Cf. A093347, A093349` `Cf. A060904.` `Sequence in context: A131291 A131369 A122219 this_sequence A001050 A113784 A021651` `Adjacent sequences: A093345 A093346 A093347 this_sequence A093349 A093350 A093351`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 26 2004`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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