%I #5 Mar 05 2015 12:23:19
%S 4,6,17,604,9612,85848855,109457393440691436,
%T 16484027824615378535694780556419522,
%U 2537811713051483817817710620248313487995814710180147690293469081793581
%N a(1) = 4; 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) = 1764 = 42^2, a(4)a(3)a(2)a(1) = 6041764 = 2458^2, a(5)a(4)a(3)a(2)a(1) = 8584885596126041764 = 2929997542^2.
%Y Cf. A050636, A050637, A061359, A061363.
%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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