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<a accesskey="3" href="page.php?w=Lucas_primality_test&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=computational_number_theory">computational number theory</a>, the <b>Lucas test</b> is a <a href="page.php?w=primality_test">primality test</a> for a natural number n; it requires that the <a href="page.php?w=prime_factors">prime factors</a> of n &minus; 1 be already known. It is the basis of the <a href="page.php?w=Pratt_certificate">Pratt certificate</a> that gives a concise verification that n is prime.</p>

<p><big>Concepts</big></p>
<p>Let n be a positive integer.  If  there exists an integer a, 1&nbsp;<&nbsp;a</i>&nbsp;<&nbsp;n</i>, such that</&nbsp;n</i></&nbsp;a</i></p><p>
<a accesskey="3" href="page.php?w=Lucas_primality_test&amp;p=2">3.Next</a>
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