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%I #7 Jun 18 2022 10:08:10
%S 212,313,414,515,616,717,818,919,121,323,424,525,626,727,828,929,131,
%T 232,434,535,636,737,838,939,141,242,343,545,646,747,848,949,151,252,
%U 353,454,656,757,858,959
%N If k is a palindrome made of only two nonzero digits a and b then the palindrome arising by swapping the digits a and b.
%C If a(r) = s then a(s) = r.
%e The term corresponding to 1221221 is 2112112 and vice versa.
%K base,easy,nonn
%O 1,1
%A _Amarnath Murthy_, Oct 27 2003