id:A122772 - OEIS Search Results

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Numbers n, excluding powers of 2, such that a regular n-sided polygon can be constructed with a ruler and compasses.

+0
1

3, 5, 6, 10, 12, 15, 17, 20, 24, 30, 34, 40, 48, 51, 60, 68, 80, 85, 96, 102, 120, 136, 160, 170, 192, 204, 240, 255, 257, 272, 320, 340, 384, 408, 480, 510, 514, 544, 640, 680, 768, 771, 816, 960, 1020, 1028, 1088, 1280, 1285, 1360, 1536, 1542, 1632, 1920, 2040 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Sequence A003401 with powers of 2 deleted.`
	LINKS	`Eric Weisstein's World of Mathematics, Fermat Prime.`
	CROSSREFS	`See A003401, which is the main entry for this problem.` `Adjacent sequences: A122769 A122770 A122771 this_sequence A122773 A122774 A122775` `Sequence in context: A047327 A028927 A099190 this_sequence A140449 A115823 A112926`
	KEYWORD	`nonn`
	AUTHOR	`Alexander Adamchuk (alex(AT)kolmogorov.com), Oct 29 2006, revised Nov 07 2006`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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