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 A066598 #14 Aug 19 2025 05:18:46
%S A066598 1015560,1446480,1854720,10155600,14464800,18547200,51665040,59552640,
%T A066598 67944240,78127560,82623060,88560360,95236960,99497160,101556000,
%U A066598 105094080,108656860,110937960,117681480,118072080,124942090,135647680
%N A066598 Numbers which can be expressed as the product of a number and its reversal in four different ways.
%H A066598 Chai Wah Wu, <a href="/A066598/b066598.txt">Table of n, a(n) for n = 1..10000</a>
%H A066598 Shyam Sunder Gupta, <a href="https://doi.org/10.1007/978-981-97-2465-9_12">Equal Product of Reversible Numbers (EPRN)</a>, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 12, 353-365.
%t A066598 f[n_] := (m = ToExpression[StringReverse[ToString[n]]]; If[n > m, n*m, 0]); a = Sort[ Table[ f[n], {n, 0, 10^6}]]; While[ a[[1]] == 0, a = Drop[a, 1]]; a[[ Select[ Range[ Length[a]] - 3, a[[ # ]] == a[[ # + 3 ]] & ]]]
%Y A066598 Cf. A066531.
%K A066598 nonn,base
%O A066598 1,1
%A A066598 _Robert G. Wilson v_, Jan 08 2002