2. Find the first ten terms of the sequence of pseudo-random numbers generated by the linear congruential method with $x_{0}=6$ and $x_{n+1} \equiv 5 x_{n}+2(\bmod 19)$. What is the period length of this generator?
2. $6.13,10,14,15,1,7,18,16,6,13, \ldots$ period length is 9