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 A115744 #11 Jul 29 2025 00:21:26
%S A115744 6,10,15,21,28,36,45,55,66,231,528,666,1128,2016,2211,2628,2775,3003,
%T A115744 3570,3916,4095,5995,6105,6216,6903,8646,21736,31878,34980,37950,
%U A115744 43956,45753,52003,58653,65703,66066,73153,83028,89676,93528,116886
%N A115744 Triangular numbers that are the product of 2 palindromes greater than 1.
%H A115744 Harvey P. Dale, <a href="/A115744/b115744.txt">Table of n, a(n) for n = 1..83</a> (All terms less than 1 million)
%e A115744 6903=T(117) and 6903=9*767.
%t A115744 Module[{upto=120000,pals},pals=Select[Range[2,upto/2],PalindromeQ];Select[ Times@@@Tuples[pals,2],OddQ[Sqrt[8#+1]]&&#<=upto&]]//Union (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 13 2018 *)
%Y A115744 Cf. A115683, A115743, A115745.
%K A115744 nonn,base
%O A115744 1,1
%A A115744 _Giovanni Resta_, Jan 31 2006