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Search: id:A004729
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| A004729 |
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Divisors of 2^32 - 1 (polygons with an odd number of sides constructible with ruler and compass). |
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+0
10
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| 1, 3, 5, 15, 17, 51, 85, 255, 257, 771, 1285, 3855, 4369, 13107, 21845, 65535, 65537, 196611, 327685, 983055, 1114129, 3342387, 5570645, 16711935, 16843009, 50529027, 84215045, 252645135, 286331153, 858993459, 1431655765, 4294967295
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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The 32 divisors of the product of the 5 known Fermat primes.
The only known odd numbers whose totient is a power of 2 - Labos E. (labos(AT)ana.sote.hu), Dec 06 2000
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REFERENCES
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J. H. Conway and R. K. Guy, The Book of Numbers, Copernicus Press, New York, 1996; see p. 140.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Eric Weisstein's World of Mathematics, Sierpinski Sieve
Eric Weisstein's World of Mathematics, Constructible Polygon
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MATHEMATICA
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Divisors[2^32-1]
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CROSSREFS
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Essentially same as A045544.
Cf. A000010, A000215, A001317, A003401, A003527, A004169, A004729, A019434, A045544, A047999, A053576, A054432.
Sequence in context: A018358 A094358 A003527 this_sequence A045544 A001317 A053576
Adjacent sequences: A004726 A004727 A004728 this_sequence A004730 A004731 A004732
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KEYWORD
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nonn,fini,full,easy
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AUTHOR
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njas
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