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 A083407 #32 Aug 25 2025 02:14:11 %S A083407 1239016098321,1503617940841,1842890415961,11151144884889, %T A083407 12909311260209,149920947896841,181937770841761,12128839583882121, %U A083407 12598313930168521,12639203218972521,13081277143774921,14462953695004441,14999934809556841,15260975534573041 %N A083407 Odd squares which can be expressed as the product of a number and its reversal in at least two different ways. %D A083407 S. S. Gupta, EPRNs, Science Today, Feb. 1987, India. %H A083407 Chai Wah Wu, <a href="/A083407/b083407.txt">Table of n, a(n) for n = 1..126</a> %H A083407 Shyam Sunder Gupta, <a href="http://www.shyamsundergupta.com/eporns.htm">EPRN Numbers</a>. %e A083407 1239016098321 = 1113111 * 1113111 = 1022121 * 1212201, etc. %Y A083407 Cf. A066531, A083406 (even squares version), A083408 (all squares version). %K A083407 nonn,base,changed %O A083407 1,1 %A A083407 _Shyam Sunder Gupta_, Jun 07 2003 %E A083407 Corrected by _Hans Havermann_, Feb 13 2012 %E A083407 a(4)-a(14) (including four found by _Hans Havermann_) from _Donovan Johnson_, Feb 18 2012 %E A083407 Definition corrected by _N. J. A. Sloane_, Aug 01 2019