A164840 Right-truncatable squares: every prefix is square.

1, 4, 9, 16, 49, 169

Offset

1,2

Comments

This sequence is finite and 169 is the last term. If there were to be another term, it must have three digits and contract to either 16 or 49; or have four digits and contract to 169. No such square exists. [From Sean A. Irvine, Sep 08 2009]

Links

Table of n, a(n) for n=1..6.

Example

a(6) = 169 since 169 is a perfect square and also 1 and 16 are perfect squares.

Crossrefs

Sequence in context: A112735 A059931 A027382 * A023110 A277699 A368891

Adjacent sequences: A164837 A164838 A164839 * A164841 A164842 A164843

Keyword

nonn,base,full,fini

Author

Gaurav Kumar, Aug 28 2009

Extensions

Keywords full, fini from Max Alekseyev, Sep 11 2009

Status

approved