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On Composite Numbers P Which Satisfy the Fermat Congruence $a^{P-1} \equiv 1 \operatorname{mod} P$

R. D. Carmichael
The American Mathematical Monthly
Vol. 19, No. 2 (Feb., 1912), pp. 22-27
DOI: 10.2307/2972687
Stable URL:
Page Count: 6
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