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A247312 Positive numbers not divisible by 10 whose squares remain squares when prefixed with 100. 3

%I #7 Sep 14 2014 00:22:46

%S 11252109375,47450841796875,187605480615234375,712096246922607421875,

%T 2627953955633148193359375,9500846300153588104248046875,

%U 29357159521824837441192448139190673828125,80932484400013426603726400434970855712890625,218326368611836548856645001359283924102783203125

%N Positive numbers not divisible by 10 whose squares remain squares when prefixed with 100.

%C Square roots of A247262.

%H Chai Wah Wu, <a href="/A247312/b247312.txt">Table of n, a(n) for n = 1..168</a>

%e 11252109375^2 = 126609965386962890625 and 100126609965386962890625 is square.

%Y Cf. A247261, A247262, A247263, A247264.

%K nonn

%O 1,1

%A _Chai Wah Wu_, Sep 13 2014

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Last modified July 17 14:18 EDT 2024. Contains 374377 sequences. (Running on oeis4.)