A068176 a(1) = 2; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1).

2, 25, 225, 1225, 13225, 133225, 10336225, 1033622500, 103362250000, 10336225000000, 1033622500000000, 103362250000000000, 10336225000000000000, 1033622500000000000000, 103362250000000000000000, 10336225000000000000000000, 1033622500000000000000000000

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Example

a(2) = 25. hence a(3) = 225 the smallest square formed from 25.

Crossrefs

Cf. A068175, A091875 gives square roots.

Sequence in context: A203767 A206392 A074438 * A131585 A042919 A229975

Adjacent sequences: A068173 A068174 A068175 * A068177 A068178 A068179

Keyword

base,nonn

Author

Amarnath Murthy, Feb 25 2002

Extensions

Corrected and extended by Ray Chandler, Oct 11 2003

a(16)-a(17) from Pontus von Brömssen, Feb 05 2026

Status

approved