A119998 a(n) is the smallest positive integer whose square starts with (at least) n identical digits.
1, 15, 149, 2357, 10541, 57735, 745356, 1490712, 182574186, 298142397, 298142397, 1490711985, 1490711985, 10540925533895, 74535599249993, 105409255338946, 7453559924999299, 14907119849998598, 471404520791031683, 7453559924999298988
Offset: 1
Examples
Note that 15^2 = 225 and 149^2 = 22201.
Links
- Alois P. Heinz, Table of n, a(n) for n = 1..200
Formula
a(n) <= A119511(n). - R. J. Mathar, Aug 08 2006
a(n) = sqrt(A192934(n)). - Alois P. Heinz, Sep 02 2011
Extensions
More terms from R. J. Mathar, Jul 29 2006
More terms from R. J. Mathar, Aug 08 2006