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 A008917 Numbers that are the sum of 3 positive cubes in more than one way. 10
 251, 1009, 1366, 1457, 1459, 1520, 1730, 1737, 1756, 1763, 1793, 1854, 1945, 2008, 2072, 2241, 2414, 2456, 2458, 2729, 2736, 3060, 3391, 3457, 3592, 3599, 3655, 3745, 3926, 4105, 4112, 4131, 4168, 4229, 4320, 4376, 4402, 4437, 4447 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Of course reordering the terms does not count. A025456(a(n)) > 1. [Reinhard Zumkeller, Apr 23 2009] LINKS T. D. Noe and Christian N. K. Anderson, Table of n, a(n) for n = 1..10000 (first 1000 terms are from T. D. Noe) Christian N. K. Anderson, Decomposition of first 10000 terms into multiple cube triples. EXAMPLE a(2) = 1009 = 1^3+2^3+10^3 = 4^3+6^3+9^3. MATHEMATICA Select[Range[4450], 1 < Length @ Cases[PowersRepresentations[#, 3, 3], {_?Positive, _?Positive, _?Positive}] &]  (* Jean-François Alcover, Apr 04 2011 *) PROG (PARI) is(n)=k=ceil((n-2)^(1/3)); d=0; for(a=1, k, for(b=a, k, for(c=b, k, if(a^3+b^3+c^3==n, d++)))); d n=3; while(n<5000, if(is(n)>1, print1(n, ", ")); n++) \\ Derek Orr, Aug 27 2015 CROSSREFS Sequence in context: A179231 A108833 A228672 * A025396 A185941 A215607 Adjacent sequences:  A008914 A008915 A008916 * A008918 A008919 A008920 KEYWORD nonn,easy,nice AUTHOR STATUS approved

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Last modified October 21 03:00 EDT 2020. Contains 337910 sequences. (Running on oeis4.)