A119511 a(n) is the smallest positive integer whose square starts with precisely n identical digits.

1, 15, 149, 2357, 10541, 57735, 745356, 1490712, 182574186, 2357022604, 298142397, 7453559925, 1490711985, 10540925533895, 74535599249993, 105409255338946, 7453559924999299, 14907119849998598, 471404520791031683

Offset

1,2

Links

Hans Havermann, Table of n, a(n) for n = 1..1000

Example

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

Crossrefs

Cf. A119998.

Sequence in context: A211847 A055431 A119998 * A023069 A121035 A022739

Adjacent sequences: A119508 A119509 A119510 * A119512 A119513 A119514

Keyword

base,nonn

Author

Tanya Khovanova, Jul 26 2006

Extensions

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

Status

approved