Number TheoryMediumOrders and Primitive Roots ShareOrders and Primitive Roots · Medium problemFor which prime ppp does x2≡−1(modp)x^2 \equiv -1 \pmod px2≡−1(modp) have a solution?Ap=19p = 19p=19Bp=23p = 23p=23Cp=29p = 29p=29Dp=31p = 31p=31Check Show answer Walk through it step by step Practice more like this Review this concept