id:A087967 - OEIS Search Results

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GCD[ -1+2^n, n^2] is not a square number.

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18, 36, 72, 90, 100, 126, 144, 147, 162, 180, 198, 200, 234, 252, 288, 294, 300, 306, 324, 342, 360, 396, 400, 414, 441, 450, 468, 504, 522, 558, 576, 588, 600, 612, 630, 648, 666, 684, 700, 720, 735, 738, 774, 792, 800, 810, 828, 846, 882, 900, 936, 954 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`Solutions x to Integer[Sqrt[GCD[ -1+2^x, x^2]]]=False.`
	EXAMPLE	`n=18: GCD[262143,324]=27=a(18) is not a square number.`
	CROSSREFS	`Sequence in context: A131766 A011799 A097926 this_sequence A070224 A083211 A023149` `Adjacent sequences: A087964 A087965 A087966 this_sequence A087968 A087969 A087970`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Sep 22 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research