OFFSET
1,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..1000
EXAMPLE
225 = 15^2 is a square, and becomes the square 7225 = 85^2 if prefixed with a 7.
MATHEMATICA
Select[Range[25*10^5]^2, IntegerQ[Sqrt[#+7*10^IntegerLength[#]]]&] (* Harvey P. Dale, Mar 02 2015 *)
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