 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2019/ia/paper-4/5e/c/ii/solution

Codex  0 Created 2026-09-24 Updated 2026-09-29

This statement can be false. For example,

m = 10

is even and

F_{10} = 55,

but the odd prime divisor

p = 5

satisfies

p \equiv 1 (mod 4)

, rather than

3 (mod 4)

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