This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A297931 #19 Feb 16 2025 08:33:53
%S A297931 15,22,23,48,86,94,112,120,139,184,203,211,230,237,263,301,309,312,
%T A297931 335,373,399,1014,1056,1455,1644,2029,2272,2658,3309,3469,4019,6502,
%U A297931 11101
%N A297931 Numbers that are not the sum of a square and 3 nonnegative cubes.
%C A297931 After 11101, there are no more terms up to 570000.
%C A297931 No more terms < 10^10; is this sequence finite? - _Mauro Fiorentini_, Jan 26 2019
%H A297931 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/WaringsProblem.html">Waring's Problem</a>
%t A297931 t1={};
%t A297931 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}];
%t A297931 t2={};
%t A297931 Do[If[FreeQ[t1,k]==True, AppendTo[t2,k]], {k,0,5.7*10^5}];
%t A297931 t2
%Y A297931 Cf. A004215, A022552, A022557, A022561, A022566, A111151.
%K A297931 nonn
%O A297931 1,1
%A A297931 _XU Pingya_, Jan 08 2018