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A083147 a(1) = 1, 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.

%I A083147 #9 Aug 11 2024 14:41:34
%S A083147 1,2,4,8,232,464,42224,84448,4053504,44588544,4057557504,
%T A083147 4053504004053504,44588544044588544,4057557508057557504,
%U A083147 401341233733484337332143104,40130110362352332623325326301103104,441431213985875658856578589312134144
%N A083147 a(1) = 1, 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.
%H A083147 Giovanni Resta, <a href="/A083147/b083147.txt">Table of n, a(n) for n = 1..19</a>
%H A083147 P. De Geest, <a href="https://www.worldofnumbers.com/em36.htm">WONplate 36</a>
%Y A083147 Cf. A083148, A068664, A083149, A083151, A083153, A083155.
%K A083147 nonn,base
%O A083147 1,2
%A A083147 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 25 2003
%E A083147 More terms from _Patrick De Geest_, Jun 05 2003
%E A083147 a(17) from _Giovanni Resta_, Sep 25 2019