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Two kinds of strong pseudoprimes up to 10(36)

机译:两种强伪素数,最高可达10(36)

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Let n > 1 be an odd composite integer. Write n-1 = 2(s)d with d odd. If either b(d) = 1 mod n or b(2rd) = -1 mod n for some r = 0, 1,..., s-1, then we say that n is a strong pseudoprime to base b, or spsp(b) for short. Define psi(t) to be the smallest strong pseudoprime to all the first t prime bases. If we know the exact value of psi t, we will have, for integers n < psi(t), a deterministic efficient primality testing algorithm which is easy to implement. Thanks to Pomerance et al. and Jaeschke, the psi(t) are known for 1 <= t <= 8. Conjectured values of psi(9),...,psi(12) were given by us in our previous papers (Math. Comp. 72 (2003), 2085-2097; 74 (2005), 1009-1024). The main purpose of this paper is to give exact values of psi'(t) for 13 <= t <= 19; to give a lower bound of psi'(20) : psi'(20) > 10(36) ; and to give reasons and numerical evidence of K2- and C-3- spsp's < 10(36) to support the following conjecture: psi(t) = psi'(t) < psi''(t) for any t >= 12, where psi(t) (resp. psi"(t)) (i)s the smallest K2- (resp. C-3-) strong pseudoprime to all the first t prime bases. For this purpose we describe procedures for computing and enumerating the two kinds of spsp's < 10(36) to the first 9 prime bases. The entire calculation took about 4000 hours on a PC Pentium IV/ 1.8GHz. (Recall that a K2- spsp is an spsp of the form: n = pq with p, q primes and q - 1 = 2(p - 1); and that a C-3- spsp is an spsp and a Carmichael number of the form: n = q(1)q(2)q(3) with each prime factor q(i) 3 mod 4.)
机译:令n> 1为奇数复合整数。用d个奇数写n-1 = 2(s)d。如果对于某些r = 0、1,...,s-1,b(d)= 1 mod n或b(2rd)= -1 mod n,那么我们说n是对b的强伪素数,或者spsp(b)的简称。将psi(t)定义为所有前t个素数基数中最小的强伪素数。如果我们知道psi t的确切值,对于整数n si(t),我们将拥有易于实现的确定性有效素数测试算法。感谢Pomerance等。和Jaeschke的psi(t)已知为1 <= t <=8。psi(9),...,psi(12)的推测值由我们在之前的论文中给出(数学比较72( 2003),2085-2097; 74(2005),1009-1024)。本文的主要目的是给出13 <= t <= 19时psi'(t)的精确值;给出psi'(20)的下界:psi'(20)> 10(36);并给出K2-和C-3- spsp <10(36)的原因和数值证据来支持以下猜想:对于任何t> = 12的psi(t)= psi'(t)si''(t) ,其中psi(t)(res。psi“(t))(i)是所有前t个素数基数中最小的K2-(result。C-3-)强伪素数。为此,我们描述了计算和将两种类型的spsp <10(36)枚举到前9个素数基数。在PC Pentium IV / 1.8GHz上,整个计算大约花费了4000个小时。(回想一下,K2- spsp是以下形式的spsp:n =具有p,q质数和​​q-1 = 2(p-1)的pq;并且C-3-spsp是spsp和形式的Carmichael数:n = q(1)q(2)q(3 ),每个素数因子q(i)3 mod4。)

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