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 A001239 Numbers that are the sum of 3 nonnegative cubes in more than 1 way. 4
 216, 251, 344, 729, 855, 1009, 1072, 1366, 1457, 1459, 1520, 1674, 1728, 1729, 1730, 1737, 1756, 1763, 1793, 1854, 1945, 2008, 2072, 2241, 2414, 2456, 2458, 2729, 2736, 2752, 3060, 3391, 3402, 3457, 3500, 3592, 3599, 3655, 3744, 3745 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES G. H. Hardy, Ramanujan, Cambridge Univ. Press, 1940, p. 12. D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, 165. LINKS Christian N. K. Anderson, Table of n, a(n) for n = 1..10000 Christian N. K. Anderson, Decomposition of first 10000 terms into cube triples MATHEMATICA Select[Range[4000], Length[PowersRepresentations[#, 3, 3]] > 1 &] (* Harvey P. Dale, Feb 03 2011 *) PROG (PARI) is(n)=my(t); for(a=0, sqrtnint(n, 3), my(a3=a^3, c); for(b=0, min(a, sqrtnint(n-a3, 3)), if(ispower(n-a3-b^3, 3, &c) && c <= b && t++>1, return(1)))); 0 \\ Charles R Greathouse IV, Jul 02 2017 CROSSREFS Cf. A001235, A003998, A008917, A025396, A025456, A025447. Sequence in context: A018863 A003998 A230400 * A184088 A205191 A204650 Adjacent sequences:  A001236 A001237 A001238 * A001240 A001241 A001242 KEYWORD nonn AUTHOR STATUS approved

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Last modified October 18 07:19 EDT 2019. Contains 328146 sequences. (Running on oeis4.)