id:A074726 - OEIS Search Results

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Numbers n such that sigma(F(n)) > 2*F(n) where F(n) is the n-th Fibonacci number.

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12, 18, 24, 30, 36, 40, 42, 48, 54, 60, 72, 80, 84, 90, 96, 108, 120, 126, 132, 140, 144, 150, 156, 160, 162, 168, 180, 192, 198, 200, 204, 210, 216, 225, 228, 234, 240, 252 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Hisanori Mishima, Appendix 1. Factorization results links to internal pages`
	FORMULA	`It seems that a(n) is asymptotic to c*n with 6 < c < 6.5.`
	MATHEMATICA	`Select[ Range[256], DivisorSigma[1, Fibonacci[ #1]] > 2*Fibonacci[ #1] & ]`
	CROSSREFS	`Sequence in context: A162151 A056773 A136446 this_sequence A091013 A159886 A113756` `Adjacent sequences: A074723 A074724 A074725 this_sequence A074727 A074728 A074729`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 04 2002`
	EXTENSIONS	`Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 06 2002`

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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