20032| 1
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[转载] 对于奇素数 p,仅有有限多个素数 x ,使得$n=\frac{x^p -1}{x-1}$是合数,并且 x|φ(n) |
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毋因群疑而阻独见 毋任己意而废人言
毋私小惠而伤大体 毋借公论以快私情 |
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