Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #31 Aug 01 2019 01:07:32
%S 63504,435600,6350400,7683984,16240900,25401600,43560000,66585600,
%T 420332004,558471424,635040000,647804304,726949444,768398400,
%U 782432784,1067328900,1624090000,1897473600,2341011456,2540160000
%N Even squares which can be expressed as the product of a number and its reversal in at least two different ways.
%C For n=1..49 identical to A083408.
%D S. S. Gupta, EPRNs, Science Today, Feb. 1987, India.
%H Chai Wah Wu, <a href="/A083406/b083406.txt">Table of n, a(n) for n = 1..2372</a> (first 73 terms from Hans Havermann)
%H Shyam Sunder Gupta, <a href="http://www.shyamsundergupta.com/eporns.htm">Equal Product of Reversible Numbers</a>
%e 63504 = 252 * 252 = 144 * 441, 7683984 = 2772 * 2772 = 1584 * 4851, etc.
%Y Cf. A031877, A066531, A083407 (odd squares version), A083408 (all squares version).
%K nonn,base
%O 1,1
%A _Shyam Sunder Gupta_, Jun 07 2003
%E Corrected and extended by _Hans Havermann_, Feb 11 2012
%E Definition corrected by _N. J. A. Sloane_, Aug 01 2019