The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A161883 Smallest k such that n^3 = a_1^3+...+a_k^3 and all a_i are positive integers less than n. 6
 8, 6, 5, 7, 3, 4, 5, 3, 5, 5, 3, 4, 4, 5, 5, 5, 3, 3, 3, 4, 5, 4, 3, 3, 4, 3, 3, 3, 3, 4, 4, 4, 4, 4, 3, 4, 3, 4, 3, 3, 3, 4, 3, 3, 3, 5, 3, 4, 3, 4, 4, 3, 3, 4, 3, 3, 3, 4, 3, 5, 4, 3, 4, 4, 3, 3, 4, 3, 3, 3, 3, 4, 4, 3, 3, 4, 3, 4, 3, 3, 3, 4, 3, 3, 4, 3, 3, 3, 3, 4, 3, 3, 4, 3, 3, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 COMMENTS It follows from Wieferich's result g(3) = 9 that a(n) <= 10. Theorem 2 of Bertault, Ramaré, & Zimmermann can be used to show that a(n) <= 8 (check congruence classes of cubes mod 333 with one summand of 1, 8, or 27). Probably a(2), a(3), and a(5) are the only members greater than 5 in this sequence. - Charles R Greathouse IV, Jul 30 2011 LINKS Giovanni Resta, Table of n, a(n) for n = 2..10000 F. Bertault, O. Ramaré, and P. Zimmermann, On sums of seven cubes, Mathematics of Computation 68 (1999), pp. 1303-1310. Jean-Charles Meyrignac, Computing minimal equal sums of like powers Manfred Scheucher, Sage Script Eric W. Weisstein, Diophantine Equation 3rd Powers Eric W. Weisstein, Waring's Problem MATHEMATICA f[n_, k_] := Select[PowersRepresentations[n^3, k, 3], AllTrue[#, 0<#0&&!if(verbose, print1("/*"n" "v"*/"))&&return(k), 1))} \\ M. F. Hasler, Dec 17 2014 CROSSREFS Cf. A161882, A161884, A161885. Sequence in context: A367409 A021540 A100199 * A248618 A197329 A360167 Adjacent sequences: A161880 A161881 A161882 * A161884 A161885 A161886 KEYWORD nonn AUTHOR Dmitry Kamenetsky, Jun 21 2009 EXTENSIONS More terms from M. F. Hasler, Dec 17 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 22 06:48 EDT 2024. Contains 372743 sequences. (Running on oeis4.)