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 A115159 #13 Apr 15 2020 15:02:05
%S A115159 34,63,89,99,139,164,174,193,204,245,314,399,424,454,464,489,504,524,
%T A115159 549,714,1049,1149,1174,1439,1504,1539,1639,1799,1814,1919,2164,2239,
%U A115159 2313,2374,2414,2439,2764,2789,3079,3319,3414,3669,3774,3814,4019,4114
%N A115159 Numbers that are not the sum of a triangular number, a square and a fourth power.
%C A115159 There are 718 such numbers up to 2*10^9, the last one in this range being 99570649.
%C A115159 It is known that each natural number can be written as the sum of two squares and a triangular number. I believe that the sequence only has 718 terms as found by __Giovanni Resta_ and listed in the b-file. - _Zhi-Wei Sun_, Apr 15 2020
%H A115159 Zhi-Wei Sun, <a href="/A115159/b115159.txt">Table of n, a(n) for n = 1..718</a>
%H A115159 Zhi-Wei Sun, <a href="http://dx.doi.org/10.4064/aa127-2-1">Mixed sums of squares and triangular numbers</a>, Acta Arith. 127(2007), 103-113.
%t A115159 TQ[n_]:=TQ[n]=IntegerQ[Sqrt[8n+1]];
%t A115159 tab={};Do[Do[If[TQ[n-x^4-y^2],Goto[aa]],{x,0,n^(1/4)},{y,0,Sqrt[n-x^4]}];tab=Append[tab,n];Label[aa],{n,0,4114}];Print[tab] (From _Zhi-Wei Sun_)
%Y A115159 Cf. A022552, A014158, A115160, A115161, A115162, A115163, A262959, A334086, A334113.
%K A115159 nonn
%O A115159 1,1
%A A115159 _Giovanni Resta_, Jan 15 2006
%E A115159 Definition corrected by _Giovanni Resta_, Aug 17 2011