The positive integer solutions of equation φ(φ(φ(x)))=2 are discussed,and the all 17 positive integer solutions of this equation are given by elementary method,where φ(x) is Euler function.
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热伊麦·阿卜杜力木.方程φ(φ(φ(x)))=2的正整数解[J].重庆工商大学学报(自然科学版),2015,32(11):43-47 Rahima·Abdilim. Positive Integer Solutions of Equation φ(φ(φ(x)))=2[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2015,32(11):43-47