A068175 a(1) = 1; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1).

1, 16, 169, 1369, 13689, 134689, 13446889, 1344468889, 134444688889, 13444446888889, 1344444468888889, 134444444688888889, 13444444446888888889, 1344444444468888888889, 134444444444688888888889

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Example

a(3) = 169; the smallest square obtained by inserting digits in it is 1369 hence a(4) = 1369.

Crossrefs

A067633 gives square roots.

Sequence in context: A017210 A283574 A067711 * A238976 A242078 A264092

Adjacent sequences: A068172 A068173 A068174 * A068176 A068177 A068178

Keyword

base,nonn

Author

Amarnath Murthy, Feb 25 2002

Extensions

Corrected and extended by Ray Chandler, Oct 11 2003

Status

approved