id:A039656 - OEIS Search Results

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Becomes prime after n iterations of f(x) = sigma(x)-1 (least inverse of A039655).

+0
8

2, 6, 4, 27, 12, 9, 121, 301, 930, 484, 578, 441, 1273, 468, 4863, 3171, 9216, 8373, 19692, 19416, 25442, 13440, 19230, 16641, 16804, 83161, 100652, 226181, 203400, 133200, 419248, 380979, 744796, 553296, 634710, 539476, 505584, 674416, 634206 (list; graph; listen)

	OFFSET	`0,1`
	CROSSREFS	`Cf. A039649-A039655.` `Sequence in context: A096085 A106831 A038212 this_sequence A006233 A164020 A057643` `Adjacent sequences: A039653 A039654 A039655 this_sequence A039657 A039658 A039659`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research