13. How Many Integers Have Order d Modulo p? | Theorem 8.6 | Number Theory by David M Burton

Elementary Number Theory by David M. Burton | Alternative Proof of Wilson’s Theorem Using Lagrange’s Theorem
Chapter#8 Primitive Roots and Indices
In this lecture we will prove theorem 8.6 that can be stated as
If p is a prime and d|p-1, then there are exactly ϕ(d) incongruent integers having order d modulo p.
📘 Reference Book:
David M. Burton — Elementary Number Theory
📌 Chapter 8: Primitive Roots and Indices
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