8125
Smallest natural number that can be obtained as sum of two square numbers in five different ways:
8125
= 5^2 + 90^2 = 27^2 + 86^2 = 30^2 + 85^2 = 50^2 + 75^2 = 58^2 + 69^2
more interesting 4-digit numbers:
1061
1105
2520
4225
5525
5777
5993
6174
8128
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8125
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