OFFSET
1,1
LINKS
Jon E. Schoenfield, Table of n, a(n) for n = 1..221
Four Puzzles for the Price of One - from the 1997 USSR math olympiad
EXAMPLE
1681 is a square, where the first two digits form a square and the last two digits form a nonzero square.
MATHEMATICA
Flatten[Table[ Select[Flatten[ Table[FromDigits[ Join[IntegerDigits[i^2], PadLeft[IntegerDigits[j^2], n]]], {i, Floor[Sqrt[10^(n - 1)]], Floor[Sqrt[10^n - 1]]}, {j, Floor[Sqrt[10^n - 1]]}]], IntegerQ[Sqrt[ # ]] &], {n, 5}]]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Tanya Khovanova, Oct 21 2008
EXTENSIONS
More terms from Jon E. Schoenfield, Nov 17 2008
Edited by Charles R Greathouse IV, Aug 02 2010
STATUS
approved