设a是大于1的正整数.文章证明了:如果a-1是完全方幂,则a不能表成1+x+…+xm之形,其中x和m都是大于1的正整数.
then a cannot be Let a be a positive integer with a〉l. We prove that if a-1 is a perfect power, expressed as 1+x+…+ x^m ,where x and m are positive integer with min(x,m) 〉1