OFFSET
1,3
EXAMPLE
11 being the concatenation of 1 and 1, both squares, is in the sequence.
120 is not in the sequence as none of 2, 12, 20 and 120 are squares. - corrected by Peter Munn, Nov 17 2017
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Zak Seidov, Oct 15 2009
EXTENSIONS
Corrected and extended by Michel Marcus, Oct 16 2013
Mispositioning of example corrected by Peter Munn, Nov 17 2017
STATUS
approved