Search: id:A018890
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%I A018890
%S A018890 7,14,21,42,47,49,61,77,85,87,103,106,111,112,113,122,140,148,159,166,
%T A018890 174,178,185,204,211,223,229,230,237,276,292,295,300,302,311,327,329,337,
%U A018890 340,356,363,390,393,401,412,419,427,438,446,453,465,491,510,518,553,616
%N A018890 Smallest expression as sum of positive cubes requires exactly 7 cubes.
%D A018890 J. Bohman and C.-E. Froberg, Numerical investigation of Waring's problem 
               for cubes, Nordisk Tidskr. Informationsbehandling (BIT) 21 (1981), 
               118-122.
%D A018890 K. S. McCurley, An effective seven-cube theorem, J. Number Theory, 19 
               (1984), 176-183.
%D A018890 J. Roberts, Lure of the Integers, entry 239.
%H A018890 T. D. Noe, <a href="b018890.txt">Table of n, a(n) for n=1..121</a>
%H A018890 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CubicNumber.html">Link to a section of The World of Mathematics.</
               a>
%H A018890 <a href="Sindx_Su.html#ssq">Index entries for sequences related to sums 
               of cubes</a>
%H A018890 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               WaringsProblem.html">Waring's Problem</a>
%Y A018890 Cf. A004829, A018888, A018889.
%Y A018890 Sequence in context: A100451 A028555 A061823 this_sequence A118502 A036556 
               A013644
%Y A018890 Adjacent sequences: A018887 A018888 A018889 this_sequence A018891 A018892 
               A018893
%K A018890 nonn,fini,nice
%O A018890 1,1
%A A018890 Anon
%E A018890 It is conjectured that a(121)=8042 is the last term - Jud McCranie (j.mccranie(AT)comcast.net)

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