A068177 a(1) = 3; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1).

3, 36, 361, 32761, 323761, 32137561, 3211375561, 321113755561, 32111137555561, 3211111375555561, 321111113755555561, 32111111137555555561, 3211111111375555555561, 321111111113755555555561

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Example

a(2)=36, hence a(3) = 361 the smallest square formed from 36.

Crossrefs

Cf. A068175, A068176, A091876 gives square roots.

Sequence in context: A026121 A055303 A274403 * A249894 A099670 A259131

Adjacent sequences: A068174 A068175 A068176 * A068178 A068179 A068180

Keyword

base,nonn

Author

Amarnath Murthy, Feb 25 2002

Extensions

Corrected and extended by Ray Chandler, Oct 11 2003

Status

approved