中文

论和为其积之反序的整数

数论 2021-12-13 v2 形式语言与自动机理论

摘要

我们确定了所有满足 a+ba+ba×ba \times b 的十进制数字逆序相同的正整数对 (a,b)(a,b)(2,2),(9,9),(3,24),(2,47),(2,497),(2,4997),(2,49997), (2,2), (9,9), (3,24), (2,47), (2,497), (2,4997), (2,49997), \ldots 我们使用确定性有限自动机来描述我们的方法,该方法自然推广到所有其他数基。我们的自动机是 Young 图概念的一种变体,Young 图由 Sloane 引入以研究“反序倍数”。

关键词

引用

@article{arxiv.2108.13441,
  title  = {On Integers Whose Sum is the Reverse of their Product},
  author = {Xander Faber and Jon Grantham},
  journal= {arXiv preprint arXiv:2108.13441},
  year   = {2021}
}

备注

15 pages; 4 figures; added additional references to the literature and a new section; Python experimentation/visualization code available at https://github.com/RationalPoint/reverse