id:A055020 - OEIS Search Results

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Number of iterations of sigma() required until 2n (or greater) is reached.

+0
2

2, 2, 2, 2, 1, 2, 2, 3, 2, 2, 1, 3, 2, 2, 2, 2, 1, 2, 1, 2, 2, 2, 1, 3, 2, 2, 1, 2, 1, 2, 2, 2, 2, 2, 1, 3, 2, 2, 1, 2, 1, 3, 2, 2, 2, 2, 1, 3, 2, 2, 2, 2, 1, 2, 1, 2, 2, 2, 1, 3, 2, 2, 2, 2, 1, 3, 2, 2, 1, 2, 1, 3, 2, 2, 2, 2, 1, 2, 1, 4, 2, 2, 1, 2, 2, 2, 1, 2, 1, 2, 2, 2, 2, 2, 1, 3, 2, 2, 1, 2, 1, 2, 1 (list; graph; listen)

	OFFSET	`2,1`
	EXAMPLE	`sigma(sigma(sigma(9)))=24 >= 2*9, so a(9)=3.`
	CROSSREFS	`Cf. A000203, A055021.` `Sequence in context: A090044 A036238 A063982 this_sequence A052435 A094701 A054715` `Adjacent sequences: A055017 A055018 A055019 this_sequence A055021 A055022 A055023`
	KEYWORD	`nonn`
	AUTHOR	`Jud McCranie (j.mccranie(AT)comcast.net), May 31 2000`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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