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A122772
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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.
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0
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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; refs; listen; history; internal format)
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