A106324 Smaller of number pair whose squares are reversals of each other, with no leading zeros allowed.

21, 31, 99, 201, 301, 211, 311, 221, 2001, 3001, 1101, 2101, 3101, 1201, 2201, 1301, 2011, 3011, 2111, 3111, 1211, 2211, 2021, 2121, 2102, 2202, 6501, 20001, 30001, 11001, 21001, 31001, 12001, 22001, 13001, 20101, 30101, 11101, 21101, 31101