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Largest n-digit square whose external digits as well as internal digits form a square, or 0 if no such number exists.
2

%I #10 Aug 06 2024 22:19:13

%S 9,81,841,0,38416,405769,8003241,82246761,0,1021697296,86925318561,

%T 119013960256,6323524974244,60207636572164,472453565584009,0,

%U 85832135162345961,0,0,0,617801116917258936964,3633816317608493633296,0

%N Largest n-digit square whose external digits as well as internal digits form a square, or 0 if no such number exists.

%H Max Alekseyev, <a href="/A077364/b077364.txt">Table of n, a(n) for n = 1..91</a>

%Y Cf. A077355, A077356, A077357, A077363.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Nov 05 2002

%E More terms from _Erich Friedman_, Aug 08 2005

%E More terms from _Max Alekseyev_, Apr 24 2010