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A119998 a(n) is the smallest positive integer whose square starts with (at least) n identical digits. 6

%I #12 Sep 27 2013 15:18:52

%S 1,15,149,2357,10541,57735,745356,1490712,182574186,298142397,

%T 298142397,1490711985,1490711985,10540925533895,74535599249993,

%U 105409255338946,7453559924999299,14907119849998598,471404520791031683,7453559924999298988

%N a(n) is the smallest positive integer whose square starts with (at least) n identical digits.

%H Alois P. Heinz, <a href="/A119998/b119998.txt">Table of n, a(n) for n = 1..200</a>

%F a(n) <= A119511(n). - _R. J. Mathar_, Aug 08 2006

%F a(n) = sqrt(A192934(n)). - _Alois P. Heinz_, Sep 02 2011

%e Note that 15^2 = 225 and 149^2 = 22201.

%Y Cf. A119511, A192934.

%K base,nonn

%O 1,2

%A _Tanya Khovanova_, Jul 26 2006

%E More terms from _R. J. Mathar_, Jul 29 2006

%E More terms from _R. J. Mathar_, Aug 08 2006

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)