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%I #11 Aug 11 2024 14:41:34
%S 9,171,1881,171171,1882881,306909603,11355655311,1033364633301,
%T 1034397997934301,10241574577547514201,10231343244544544234313201,
%U 112544775689989986577445211,1023144555797698967975554413201,102221350448336861989168633844053122201,11233003103852144358833233885344125830130033211
%N a(1) = 9, a(n) = smallest nontrivial palindromic multiple of a(n-1). a(n) is not equal to a(n-1) or a concatenation of a(n-1) with itself.
%C Variant of A068668. [From _R. J. Mathar_, Dec 15 2008]
%H P. De Geest, <a href="https://www.worldofnumbers.com/em36.htm">WONplate 36</a>
%Y Cf. A083156, A068668, A083153, A083151, A083149, A083147.
%K base,nonn
%O 1,1
%A _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 25 2003
%E Corrected and extended by _Patrick De Geest_, Jun 05 2003
%E a(14)-a(15) from _Giovanni Resta_, Sep 25 2019