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Numbers n such that n^2 can be split into two nonzero squares (perhaps with leading zeros) in exactly two different ways.
1

%I #9 Feb 20 2022 21:45:08

%S 253,1265,2225,2530,6325,12650,18025,18975,22250,24982,25300,31625,

%T 63250,94875,126500,158125,180250,189750,221375,222500,249820,253000,

%U 316250,632500,702247,948750,1265000,1581250,1802500,1897500,2213750,2225000,2498200,2530000

%N Numbers n such that n^2 can be split into two nonzero squares (perhaps with leading zeros) in exactly two different ways.

%e 2225^2=4950625 can be split into 49=7^2 and 50625=225^2 or into 4=2^2 and 950625=975^2; 2530^2=6400900 can be split into 6400=80^2 and 900=30^2 or into 64=8^2 and 00900=30^2

%Y Cf. A048375, A054738.

%K base,nonn

%O 1,1

%A _Henry Bottomley_, Apr 26 2000

%E More terms from _Sean A. Irvine_, Feb 20 2022