How to find prime numbers where $\frac{1}{p}$ has decimal period of $p-1$? Is there any formula? please help. Example: $\frac{1}{7}=0.142857142857...$ with decimal period of $7-1=6$ also $17$ satisfies this condition, but $13$ does not.
2026-03-29 18:32:45.1774809165
Prime numbers which 1/p has decimal period of p-1
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