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%I #9 Oct 10 2019 00:37:05
%S 1,4,6,6,6,4,9,8,55,262,8,9,777,88,545,737,949,717,767,77,777,111,444,
%T 77,767,42624,737,9,575,7117,606,6116,737,838,52825,717,828,58085,
%U 914323419,676,747,585,3113,737,9,4224,959,838,33,5005,22822,12821,282
%N Largest palindromic substring in 4^n.
%t Table[Max[Select[FromDigits/@Flatten[Table[Partition[IntegerDigits[4^n],k,1],{k,IntegerLength[4^n]}],1],PalindromeQ]],{n,0,60}] (* _Harvey P. Dale_, Sep 25 2019 *)
%Y Cf. A046270.
%K nonn,base
%O 0,2
%A _Patrick De Geest_, Jun 15 1998
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