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 A069673 #16 May 21 2022 19:41:58 %S A069673 10,120,153,190,300,351,630,820,17578,87571,156520,180300,185745, %T A069673 547581,557040,678030,1461195,1851850,5911641,6056940,12145056, %U A069673 12517506,16678200,56440000,60571521,65054121,157433640,188267310,304119453,354911403,1261250200 %N A069673 Nonpalindromic triangular numbers whose digit reversal is also a triangular number (possibly with fewer digits). %H A069673 Giovanni Resta, <a href="/A069673/b069673.txt">Table of n, a(n) for n = 1..123</a> (terms < 2*10^24) %Y A069673 See A066528 for a different version. %Y A069673 Cf. A066703, A179889. %Y A069673 Cf. A003098, A061455, A066569. %K A069673 nonn,base %O A069673 1,1 %A A069673 _Amarnath Murthy_, Apr 06 2002 %E A069673 More terms from _Jason Earls_, Jun 07 2002 %E A069673 a(27)-a(31) from _Giovanni Resta_, Jun 20 2015