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A051916
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The Greek sequence: 2^a * 3^b * 5^c where a = 0,1,2,3..., b,c in {0,1}, excluding the terms 1,2; that is: (a,b,c) =/= (0,0,0), (1,0,0)):.
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8
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3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240, 256, 320, 384, 480, 512, 640, 768, 960, 1024, 1280, 1536, 1920, 2048, 2560, 3072, 3840, 4096, 5120, 6144, 7680, 8192, 10240, 12288, 15360, 16384, 20480
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Contribution from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 19 2010: (Start)
a(n+4) = 2*a(n) for n > 8;
union of A007283, A020707, A020714, and A110286;
intersection of A051037 and A003401 apart from terms 1 and 2. (End)
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REFERENCES
| George E. Martin: Geometric Constructions. New York: Springer, 1997, p. 140.
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LINKS
| R. Zumkeller, Table of n, a(n) for n = 1..1000 [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 19 2010]
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FORMULA
| G.f.: (3x^7+2x^6+2x^5+2x^4+6x^3+5x^2+4x+3)/(1-2x^4).
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CROSSREFS
| Sequence in context: A026506 A198382 A173946 * A130216 A120162 A002859
Adjacent sequences: A051913 A051914 A051915 * A051917 A051918 A051919
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KEYWORD
| nonn,easy,nice
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AUTHOR
| Antreas P. Hatzipolakis (xpolakis(AT)otenet.gr), Dec 17 1999
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Dec 18 1999
Offset corrected by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 10 2010
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