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In 2016 Izadi and Nabardi (b) showed (4-2-4) has infinitely many integersolutions. They used a specific congruent number elliptic curve.In 2019 Janfadaand Nabardi,item C, showed that a necessary condition for n to have an integralsolution for the above equation and gave a parametric solution.They gave thenumeric solutions for n=41,136,313,1028,1201,3281. In 2020 Ajai Choudhry ,Iliya Bluskov and Alexander James (a), showed that equation (4-2-4) hasinfinitely many parametric solutions. They gave the numeric solutions forn=17,257,626,641,706,1921.

Diophantine Equation $n(x^4+y^4)=z^4+w^4$