This paper discusses the 3x+1 problem,gives an estimate of the range of the questionable num-bers which make this conjecture untenable,derives a recurrence relation,and simplifies the 3x+1 operation by the ternary number system.
本文对使叙拉古猜想不成立的可疑数范围，给出了较［１］更精确的结论，还导出一个递推关系，并用三进数制简化了叙拉古运算。