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A061361 a(1) = 4; a(n) = least number such that the concatenation a(n)a(n-1)...a(2)a(1) is a square. 6

%I

%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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Last modified August 5 22:11 EDT 2020. Contains 336214 sequences. (Running on oeis4.)