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A018890
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Smallest expression as sum of positive cubes requires exactly 7 cubes.
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4
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| 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
| T. D. Noe, Table of n, a(n) for n=1..121
Eric Weisstein's World of Mathematics, Cubic Number
Index entries for sequences related to sums of cubes
Eric Weisstein's World of Mathematics, Waring's Problem
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MATHEMATICA
| Select[Range[700], (pr = PowersRepresentations[#, 7, 3]; pr != {} && Count[pr, r_/; (Times @@ r) == 0] == 0)&] (* From Jean-François Alcover, Jul 26 2011 *)
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CROSSREFS
| Cf. A004829, A018888, A018889.
Sequence in context: A100451 A028555 A061823 * A118502 A190367 A036556
Adjacent sequences: A018887 A018888 A018889 * A018891 A018892 A018893
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KEYWORD
| nonn,fini,nice
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AUTHOR
| Anon
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EXTENSIONS
| It is conjectured that a(121)=8042 is the last term - Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu)
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