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a(n) = smallest number with n+1 digits and without zero digits whose squares have the maximal number of zero digits = A135215(n+1).
4

%I #5 Mar 31 2012 10:28:28

%S 32,448,3747,62498,248998,6244998,31623251,498998998,2449489753,

%T 28284271249

%N a(n) = smallest number with n+1 digits and without zero digits whose squares have the maximal number of zero digits = A135215(n+1).

%Y Cf. A134843, A134844, A134845, A134846, A134847, A134848, A134849, A135215, A135216, A135219.

%K nonn,base

%O 2,1

%A _Artur Jasinski_, Nov 23 2007

%E a(8)-a(11) from _Lars Blomberg_, Jun 26 2011