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

1,2

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

Example

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

Crossrefs

Cf. A119511, A192934.

Sequence in context: A021414 A211847 A055431 * A119511 A023069 A121035

Adjacent sequences: A119995 A119996 A119997 * A119999 A120000 A120001

Keyword

base,nonn

Author

Tanya Khovanova, Jul 26 2006

Extensions

More terms from R. J. Mathar, Jul 29 2006

More terms from R. J. Mathar, Aug 08 2006

Status

approved