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 A119977 #14 Sep 23 2024 22:54:50
%S A119977 3,10,36,55,66,136,153,190,253,378,496,528,820,946,1035,1128,1485,
%T A119977 3240,3403,3655,4950,5886,6903,7750,8128,8256,9316,10440,12403,13203,
%U A119977 13861,14365,14535,15051,15753,16290,17020,17205,17578,18915
%N A119977 Triangular numbers that can be written as sum of three positive cubes.
%C A119977 Intersection of A003072 and A000217.
%H A119977 Donovan Johnson, <a href="/A119977/b119977.txt">Table of n, a(n) for n = 1..6577</a>
%H A119977 <a href="/index/Su#ssq">Index entries for sequences related to sums of cubes</a>
%e A119977 153 = 17*(17+1)/2 = 5^3 + 3^3 + 1^3, therefore 153 is a term.
%t A119977 Lim=20000;Tlim=Sqrt[2Lim];Clim=Lim^(1/3);Select[Table[n(n+1)/2,{n,Tlim}],MemberQ[Total/@Tuples[Range[Clim]^3,3],#]&] (* _James C. McMahon_, Sep 23 2024 *)
%Y A119977 Cf. A113958, A003108, A000578.
%K A119977 nonn
%O A119977 1,1
%A A119977 _Reinhard Zumkeller_, Jun 03 2006
%E A119977 Two duplicated terms removed by _Donovan Johnson_, Apr 19 2011