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Pocklington primality test : ウィキペディア英語版
Pocklington primality test

In mathematics, the Pocklington–Lehmer primality test is a primality test devised by Henry Cabourn Pocklington and Derrick Henry Lehmer to decide whether a given number N is prime. The output of the test is a proof that the number is prime or that primality could not be established.
==Pocklington criterion==
The test relies on the Pocklington Theorem (Pocklington criterion) which is formulated as follows:
Let N > 1 be an integer, and suppose there exist numbers ''a'' and ''q'' such that
(1) ''q'' is prime, q \vert N - 1 and q > \sqrt- 1
(2) a^ \equiv 1 \pmod
(3) \gcd = 1
Then N is prime.〔Koblitz, Neal, A Course in Number Theory and Cryptography, 2nd Ed, Springer,1994〕

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