id:A072648 - OEIS Search Results

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a(n) = [log_{Phi}(n*sqrt(5))], where log_{Phi} is logarithm in the base Phi ( = (sqrt(5)+1)/2) and [] stands for the floor function.

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	OFFSET	`1,2`
	COMMENT	`An approximate "inverse" of A000045 (of the Fibonacci numbers).`
	MAPLE	`[seq(floor(log[(sqrt(5)+1)/2](n*sqrt(5))), n=1..120)];`
	PROGRAM	`(Scheme function:) (define (A072648 n) (cond ((zero? n) n) (else (floor->exact (/ (log (* n Sqrt5)) LogPhi)))))` `(define Sqrt5 (sqrt 5))` `(define Phi (/ (1+ Sqrt5) 2))` `(define LogPhi (log Phi))`
	CROSSREFS	`Used to construct A072649.` `Adjacent sequences: A072645 A072646 A072647 this_sequence A072649 A072650 A072651` `Sequence in context: A003860 A108216 A064631 this_sequence A072945 A120180 A063197`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen Jun 02 2002`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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