A Pythagorian Triple (PT) is a list of three numbers $(a,b,c)$ such that $a^2+b^2 = c^2$. Fermat then asked for a PT with the additional property that $a + b$ is also square.
Find a quadruple $(a,b,c,d) $ such that $(a^2+b^2=c^2, a+b=d^2)$
13-2016 Open letter to Open Source for You (OSFY)
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