%I A068117
%S A068117 1,121,12321,1234321,123454321,12345654321,1234567654321,
%T A068117 123456787654321,12345678987654321,123456789100009878664283136,
%U A068117 12345678910116040727447056,12345678910111210088193915136,1234567891011121368630088707263161
%N A068117 Smallest square beginning with concatenation of first n natural numbers.
%e A068117 a(3) = 12321 = 111^2 a(10) = 123456789100009878664283136 = 11111111065056^2.
%Y A068117 Sequence in context: A062689 A057139 A002477 this_sequence A080162 A030174 
               A066625
%Y A068117 Adjacent sequences: A068114 A068115 A068116 this_sequence A068118 A068119 
               A068120
%K A068117 base,easy,nonn
%O A068117 1,2
%A A068117 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 20 2002
%E A068117 More terms from Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 12 2002