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A122772
Numbers k, excluding powers of 2, such that a regular k-sided polygon can be constructed with a ruler and compass.
0
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
OFFSET
1,1
COMMENTS
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.
Sequence in context: A047327 A028927 A099190 * A140449 A207063 A359584
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Oct 29 2006, revised Nov 07 2006
STATUS
approved