6． 素数环问题 把从1到20这20个数摆成一个环，要求相邻的两个数的和是一个素数。 分析：用回溯算法，考察所有可能的排列。 -6. Prime numbers loop problem 1-20 from 20 before the number into a ring, adjacent to both the number of requests and is a prime number. Analysis: The retrospective algorithm, exam

verilog实现的rsa加解密系统，包括大素数生成算法，包含测试文件。-rsa encryption system using verilog, including large prime number generation algorithms, including test file.