

A164840


Righttruncatable squares: every prefix is square.


0




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



EXAMPLE

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


CROSSREFS



KEYWORD

nonn,base,full,fini


AUTHOR



EXTENSIONS



STATUS

approved



