A093348 - OEIS

This site is supported by donations to The OEIS Foundation.

A093348

A 5-fractal "castle" starting with 0.

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; refs; listen; history; internal format)

	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))`
	PROG	`(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 * A001050 A113784 A021651` `Adjacent sequences: A093345 A093346 A093347 * A093349 A093350 A093351`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 26 2004`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 13:18 EST 2012. Contains 206031 sequences.