The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #3 Mar 31 2012 19:54:08
%S 1,4,9,49,64,81
%N Left-truncatable squares: every suffix is square.
%C This sequence is finite and 81 is the last term. If another term were to exist it must contain 3 digits and contract to 49, 64, or 81. No such 3 digit square exists. [From _Sean A. Irvine_, Sep 08 2009]
%e a(5) = 64 since 64 is a perfect square and 4 is also a perfect square.
%K nonn,base,fini,full
%O 1,2
%A _Gaurav Kumar_, Aug 28 2009