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a(1) = 5, a(n) = smallest palindromic multiple of a(n-1) obtained by inserting digits anywhere in a(n-1).
8

%I #8 Dec 05 2013 19:56:13

%S 5,55,5005,505505,5005005005,50055055055005,50005050055005050005,

%T 5000005005005005005005000005,50000050055050055055055005055005000005

%N a(1) = 5, a(n) = smallest palindromic multiple of a(n-1) obtained by inserting digits anywhere in a(n-1).

%Y Cf. A082776, A082777, A082778, A082779, A082781, A082782, A082783.

%K base,more,nonn

%O 1,1

%A _Amarnath Murthy_, Apr 19 2003

%E Corrected by _Ray Chandler_, Oct 13 2003

%E a(8)-a(9) from _Sean A. Irvine_, Apr 19 2010