%I
%S 0,1,11,101,111,1001,1013,1103,10001,10101,10121,10331,100001,100133,
%T 1000001,1001001,1001201,1010301,1100211,1100323,1101211,10000001,
%U 10001333,10013201,10031113,100000001,100010001,100012001,100103001,100301113,100332101,101002101,103231203,110002011
%N Base 4 numbers whose square is a palindrome in base 4.
%H G. J. Simmons, <a href="/A002778/a002778.pdf">On palindromic squares of nonpalindromic numbers</a>, J. Rec. Math., 5 (No. 1, 1972), 1119. [Annotated scanned copy]
%Y Cf. A002778, A029986, A263610, A029987.
%K nonn,base
%O 1,3
%A _N. J. A. Sloane_, Oct 22 2015
