id:A090331 - OEIS Search Results

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Largest proper divisor of n that is also a prefix of n in binary.

+0
5

1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 3, 8, 1, 9, 1, 10, 1, 11, 1, 12, 1, 13, 3, 14, 1, 15, 1, 16, 1, 17, 1, 18, 1, 19, 1, 20, 1, 21, 1, 22, 5, 23, 1, 24, 1, 25, 3, 26, 1, 27, 1, 28, 3, 29, 1, 30, 1, 31, 7, 32, 1, 33, 1, 34, 1, 35, 1, 36, 1, 37, 1, 38, 1, 39, 1, 40, 1, 41, 1, 42, 5, 43 (list; graph; listen)

	OFFSET	`2,3`
	COMMENT	`a(n) = 1 iff A090330(n) = 0;` `a(A090332(n))=1; a(A090334(n))>1.`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)` `Eric Weisstein's World of Mathematics, Proper Divisor` `Index entries for sequences related to binary expansion of n`
	CROSSREFS	`Cf. A032742, A007088.` `Sequence in context: A133622 A158416 A162520 this_sequence A165818 A007381 A087114` `Adjacent sequences: A090328 A090329 A090330 this_sequence A090332 A090333 A090334`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 26 2003, corrected May 08 2004`
	EXTENSIONS	`Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 19 2008 at the suggestion of Leroy Quet`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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