id:A098905 - OEIS Search Results

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Odd numbers whose number of distinct prime factors is even.

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15, 21, 33, 35, 39, 45, 51, 55, 57, 63, 65, 69, 75, 77, 85, 87, 91, 93, 95, 99, 111, 115, 117, 119, 123, 129, 133, 135, 141, 143, 145, 147, 153, 155, 159, 161, 171, 175, 177, 183, 185, 187, 189, 201, 203, 205, 207, 209, 213, 215, 217, 219, 221, 225, 235, 237 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`21 is a member of sequence because 21 is odd and number of distinct prime factors of 21 i.e.2 is even.`
	CROSSREFS	`Cf. A001221.` `Sequence in context: A070537 A070005 A061346 this_sequence A024556 A046388 A056913` `Adjacent sequences: A098902 A098903 A098904 this_sequence A098906 A098907 A098908`
	KEYWORD	`easy,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Oct 14 2004`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

AT&T Labs Research