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%I #5 Mar 05 2015 12:23:38
%S 9,4,18,167,2401,4086461727,14079962896835441528,
%T 309880704108832516500624685064706000856,
%U 4681896102766617737298881383797502847166028831212571921983062786215145771871779
%N a(1) = 9; a(n) = least number such that the concatenation a(n)a(n-1)...a(2)a(1) is a square.
%e a(3)a(2)a(1) = 1849 = 43^2, a(4)a(3)a(2)a(1) = 1671849 = 1293^2.
%Y Cf. A050638, A050639, A061359, A061361.
%K nonn,base
%O 1,1
%A _Amarnath Murthy_, Apr 28 2001
%E Corrected by Larry Reeves (larryr(AT)acm.org), May 07 2001
%E More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Nov 06 2001
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