Number TheoryHardDiophantine Equations ShareDiophantine Equations · Hard problemFor which remainders r∈{0,1,…,6}r \in \{0, 1, \dots, 6\}r∈{0,1,…,6} does x2−7y=rx^2 - 7y = rx2−7y=r have no integer solutions? Give the sum of all such rrr.Check Show answer Walk through it step by step Practice more like this Review this concept