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a(1) = 9; a(n) = smallest multiple of a(n-1) which is a palindromic square.
1

%I #8 Aug 11 2024 14:41:34

%S 9,12321,102030201,12345654321,102234363432201,

%T 10022014302620341022001,10002000320024001610042002300020001

%N a(1) = 9; a(n) = smallest multiple of a(n-1) which is a palindromic square.

%H P. De Geest, <a href="https://www.worldofnumbers.com/em_square.htm">Palindromic squares</a>

%Y Cf. A069502.

%K nonn,base,hard

%O 0,1

%A _Amarnath Murthy_, Mar 30 2002

%E More terms from _Sascha Kurz_, Feb 07 2003