OFFSET
1,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..1000
EXAMPLE
9 = 3^2 is a square and becomes the square 49 = 7^2 if a 4 is attached in front of its decimal representation.
MATHEMATICA
Select[Range[450000]^2, IntegerQ[Sqrt[FromDigits[Join[{4}, IntegerDigits[ #]]]]]&] (* Harvey P. Dale, Aug 05 2014 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Claudio Meller, Oct 27 2009
EXTENSIONS
Keyword:base added by R. J. Mathar, Oct 28 2009
More terms from Chai Wah Wu, Sep 11 2014
STATUS
approved