id:A115228 - OEIS Search Results

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Non-square-free numbers n such that 2n+1 is also non-square-free (A013929).

+0
2

4, 12, 24, 40, 60, 76, 84, 112, 144, 148, 162, 171, 180, 184, 212, 220, 256, 264, 292, 312, 328, 364, 387, 400, 412, 416, 420, 423, 436, 472, 480, 508, 512, 544, 580, 612, 616, 652, 684, 688, 712, 724, 760, 796, 808, 812, 832, 837, 840, 868, 904, 912, 924 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`24 is there because 2^2 divides 24 and 7^2 divides 24*2+1.`
	CROSSREFS	`Cf. A013939, A115170.` `Sequence in context: A081935 A008006 A081937 this_sequence A088557 A046092 A008241` `Adjacent sequences: A115225 A115226 A115227 this_sequence A115229 A115230 A115231`
	KEYWORD	`easy,nonn`
	AUTHOR	`Don Reble (djr(AT)nk.ca), Mar 05 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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