Euler's Theorem (Number Theory)/Corollary 1
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Corollary to Euler's Theorem (Number Theory)
Let $p^n$ be a prime power for some prime number $p > 1$.
Let $a$ be an integer not divisible by $p: p \nmid a$.
Then:
- $a^{\paren {p - 1} p^{n - 1} } \equiv 1 \pmod {p^n}$
Proof
We have that Divisor Relation is Transitive.
Since $p \divides p^n$, it follows that:
- $p^n \nmid a$
From Euler's Theorem (Number Theory):
- $a^{\map \phi {p^n} } \equiv 1 \pmod {p^n}$
From Euler Phi Function of Prime Power:
- $\map \phi {p^n} = \paren {p - 1} p^{n - 1}$
Then:
- $a^{\paren {p - 1} p^{n - 1} } \equiv 1 \pmod {p^n}$
$\blacksquare$