id:A162284 - OEIS Search Results

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Odd numbers n such that b(n) >= n and b(b(n)) >= n, where b(n) = A161942(n) = oddpart(sigma(n)).

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1, 81, 18966025, 135187129, 164275489, 350561925, 445421025, 598047025, 649587169, 748733769, 850830561, 960362325, 1055925025, 1341097641, 1406175001, 1476326929, 1520766009, 1536248025, 1591004025, 1735566525 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Applying b a third time produces a smaller value for every number in this sequence up to 10^10, except 1.`
	LINKS	`Robert Gerbicz, Table of n,a(n) up to 10^10; n=1..43`
	CROSSREFS	`Cf. A161942.` `Sequence in context: A033435 A013851 A092258 this_sequence A116268 A128838 A051001` `Adjacent sequences: A162281 A162282 A162283 this_sequence A162285 A162286 A162287`
	KEYWORD	`nonn`
	AUTHOR	`Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Jun 29 2009`
	EXTENSIONS	`Values for n > 3 from Robert Gerbicz (robert.gerbicz(AT)gmail.com)`

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Last modified December 20 16:13 EST 2009. Contains 171081 sequences.

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