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Search: id:A018890
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| A018890 |
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Smallest expression as sum of positive cubes requires exactly 7 cubes. |
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+0
2
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| 7, 14, 21, 42, 47, 49, 61, 77, 85, 87, 103, 106, 111, 112, 113, 122, 140, 148, 159, 166, 174, 178, 185, 204, 211, 223, 229, 230, 237, 276, 292, 295, 300, 302, 311, 327, 329, 337, 340, 356, 363, 390, 393, 401, 412, 419, 427, 438, 446, 453, 465, 491, 510, 518, 553, 616
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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J. Bohman and C.-E. Froberg, Numerical investigation of Waring's problem for cubes, Nordisk Tidskr. Informationsbehandling (BIT) 21 (1981), 118-122.
K. S. McCurley, An effective seven-cube theorem, J. Number Theory, 19 (1984), 176-183.
J. Roberts, Lure of the Integers, entry 239.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..121
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to sums of cubes
Eric Weisstein's World of Mathematics, Waring's Problem
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CROSSREFS
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Cf. A004829, A018888, A018889.
Sequence in context: A100451 A028555 A061823 this_sequence A118502 A036556 A013644
Adjacent sequences: A018887 A018888 A018889 this_sequence A018891 A018892 A018893
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KEYWORD
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nonn,fini,nice
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AUTHOR
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Anon
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EXTENSIONS
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It is conjectured that a(121)=8042 is the last term - Jud McCranie (j.mccranie(AT)comcast.net)
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