計算機編程題 - 找最小偶數位對稱平方數 (ZT)

對稱數是指12321之類的、顛倒書寫順序仍不變的自然數。對稱平方數是指它是對稱數同時還是某個自然數的平方。有人證實698896是最小偶數位對稱平方數(=836^2)。請各位高手編一程序，找出另外兩個最小偶數位對稱平方數。
--- This is a good question by '巡天劍客', I'm too late to back here. But, my SAS Programm used time 1:36:17 to got 4 solutions. They are as following:

Digit=6 Root=836 Symmetric Square=698896
Digit=12 Root=798644 Symmetric Square=637832238736
Digit=16 Root=64030648 Symmetric Square=4099923883299904
Digit=22 Root=83163115486 Symmetric Square=6916103777337773016196