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 A297931 Numbers that are not the sum of a square and 3 nonnegative cubes. 0
 15, 22, 23, 48, 86, 94, 112, 120, 139, 184, 203, 211, 230, 237, 263, 301, 309, 312, 335, 373, 399, 1014, 1056, 1455, 1644, 2029, 2272, 2658, 3309, 3469, 4019, 6502, 11101 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS After 11101, there are no more terms up to 570000. No more terms < 10^10; is this sequence finite? - Mauro Fiorentini, Jan 26 2019 LINKS Eric Weisstein's World of Mathematics, Waring's Problem MATHEMATICA t1={}; Do[Do[If[x^2+y^2+z^2+w^3==n, AppendTo[t1, n]&&Break[]], {x, 0, n^(1/2)}, {y, x, (n-x^2)^(1/2)}, {z, y, (n-x^2-y^2)^(1/2)}, {w, 0, (n-x^2-y^2-z^2)^(1/3)}], {n, 0, 5.7*10^5}]; t2={}; Do[If[FreeQ[t1, k]==True, AppendTo[t2, k]], {k, 0, 5.7*10^5}]; t2 CROSSREFS Cf. A004215, A022552, A022557, A022561, A022566, A111151. Sequence in context: A236764 A300958 A066758 * A018888 A115174 A092783 Adjacent sequences:  A297928 A297929 A297930 * A297932 A297933 A297934 KEYWORD nonn AUTHOR XU Pingya, Jan 08 2018 STATUS approved

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Last modified July 17 20:45 EDT 2019. Contains 325109 sequences. (Running on oeis4.)