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A202326
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Number of regular polygons constructable by straightedge and compass up to 10^n.
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0
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5, 24, 52, 93, 145, 206, 280, 363, 456, 566, 670, 774, 886, 990, 1094, 1206, 1310, 1414, 1526, 1630, 1734, 1842, 1946, 2054, 2162, 2266, 2374, 2482, 2586, 2690, 2794, 2902, 3010, 3114, 3222, 3328, 3432, 3542, 3646, 3750, 3862, 3966, 4070, 4182, 4286, 4390
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OFFSET
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1,1
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REFERENCES
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Albert H. Beiler, Recreations in the theory of numbers, New York, Dover, (2nd ed.) 1966, p. 182.
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LINKS
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Table of n, a(n) for n=1..46.
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EXAMPLE
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a(1) = 5 since there are five regular polygons with number of sides not exceeding 10, i.e., the triangle, square, pentagon, hexagon, and octagon.
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CROSSREFS
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Cf. A003401.
Sequence in context: A063143 A006145 A219509 * A085646 A121546 A135703
Adjacent sequences: A202323 A202324 A202325 * A202327 A202328 A202329
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KEYWORD
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nonn
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AUTHOR
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Martin Renner, Dec 16 2011
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STATUS
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approved
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