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A147845
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Odd positive integers a(n) such that for every odd integer m>=7 there exists a unique representation of the form m=a(p)+2a(q)+4a(r)
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0
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1, 3, 17, 19, 129, 131, 145, 147, 1025, 1027, 1041, 1043, 1153, 1155, 1169, 1171, 8193, 8195, 8209, 8211, 8321, 8323, 8337, 8339, 9217, 9219, 9233, 9235, 9345, 9347, 9361, 9363, 65537, 65539, 65553, 65555
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Since, e.g., 27=17+2*3+4*1 and 17=a(3),3=a(2),1=a(1), then 27 has "coordinates" (3,2,1). Thus we have a one-to-one map of odd integers >=7 to the positive lattice points in the three-dimensional space.
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FORMULA
| a(n)=2A033045(n-1)+1
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CROSSREFS
| A145812 A145818 A033045 A033052 [From Vladimir Shevelev (shevelev(AT)bgu.ac.il), Nov 19 2008]
Sequence in context: A032923 A018750 A177208 * A077778 A022127 A173579
Adjacent sequences: A147842 A147843 A147844 * A147846 A147847 A147848
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KEYWORD
| nonn
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AUTHOR
| Vladimir Shevelev (shevelev(AT)bgu.ac.il), Nov 15 2008
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