id:A131293 - OEIS Search Results

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Concatenate a(n-2) and a(n-1) to get a(n); start with a(0)=0, a(1)=1, delete the leading zero. Also Fib(n)-number of '1's.

+0
2

0, 1, 1, 11, 111, 11111, 11111111, 1111111111111, 111111111111111111111, 1111111111111111111111111111111111, 1111111111111111111111111111111111111111111111111111111 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Interpreted as base-2 numbers the result is A063896.`
	FORMULA	`a(n)=a(n-2)*10^ceiling(log_10(a(n-1)))+a(n-1) for n>1.` `a(n)=(10^Fib(n)-1)/9 where Fib(n)=A000045(n).`
	EXAMPLE	`a(3)=11, a(4)=111, so a(5)=a(4)a(3)=11111.`
	CROSSREFS	`Cf. A000045, A061107, A063869.` `Sequence in context: A117293 A015468 A037842 this_sequence A108047 A144784 A030175` `Adjacent sequences: A131290 A131291 A131292 this_sequence A131294 A131295 A131296`
	KEYWORD	`nonn`
	AUTHOR	`Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Jun 26 2007`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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