Wieferich pairs and Barker sequences, II

Wieferich pairs and Barker sequences, II
复制标题

维弗里希对和巴克序列,II

DOI:
10.1112/s1461157013000223
复制
发表时间:
2013
期刊:
LMS J. Comput. Math.
影响因子:
--
通讯作者:
Michael J. Mossinghoff
Michael J. Mossinghoff
中科院分区:
--
文献类型:
--
作者:
P. Borwein;Michael J. Mossinghoff

文献摘要

被引文献

相似文献

我们证明了如果一个长度为$n>13$的Barker序列 存在,则n$=$ 3-979-201-339-721 749-133-016-171-583-224-100,或$n>4\cdot 10^{33}$ 。这使长Barker序列的长度下限提高了近2000美元。 。我们还获得了另外18个整数$n<10^{50}$ 这不能被排除为Barker序列的长度,并找到超过237,000个额外的候选者$n<10^{100}$ 。这些结果是通过完成对Wieferich素数对的广泛搜索并使用它们,以及对$n$的一些算术限制来获得的 ,以构造低于给定界的限定整数。我们还报告了一些关于循环Hadamard矩阵问题的公开情况的最新计算。
We show that if a Barker sequence of length $n>13$ exists, then either n $=$ 3 979 201 339 721 749 133 016 171 583 224 100, or $n > 4\cdot 10^{33}$ . This improves the lower bound on the length of a long Barker sequence by a factor of nearly $2000$ . We also obtain eighteen additional integers $n<10^{50}$ that cannot be ruled out as the length of a Barker sequence, and find more than 237 000 additional candidates $n<10^{100}$ . These results are obtained by completing extensive searches for Wieferich prime pairs and using them, together with a number of arithmetic restrictions on $n$ , to construct qualifying integers below a given bound. We also report on some updated computations regarding open cases of the circulant Hadamard matrix problem.