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a(n)^2 is smallest square number starting with a string of n 5's.
2

%I #6 Oct 06 2019 18:13:36

%S 23,235,745,2357,235702,745356,745356,23570226,2357022603,2357022604,

%T 7453559925,7453559925,7453559924999,74535599249993,74535599249993,

%U 7453559924999299,7453559924999299,745355992499929899,7453559924999298988,7453559924999298988

%N a(n)^2 is smallest square number starting with a string of n 5's.

%e a(5) = 235702^2 = {55555}432804.

%Y Cf. A034987.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Nov 15 1998

%E More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 23 2001