摘要
设a和b是大于1的互素的正奇数.当(a,b)=(3,5),(3,85),(5,43)或(5,63)时,方程ax+by=z2无正整数解(x,y,z).运用初等数论方法证明了以下一般性的结果:如果a是适合a≡±3(mod 8)的奇素数,b有约数d可使(a/d)=-1,其中(a/d)是Jacobi符号,则该方程仅有正整数解(a,b,x,y,z)=(11,3,4,5,122).
Let a and b be odd positive integers such that min { a, b }〉 1 and gcd ( a, b) = 1. Recently, B. Sroysang proved that if ( a, b) = (3,5), (3,85), (5,43) or (5,63), then the equation a^x +b^y =z^2 has no positive integer solutions (x,y,z). In this paper, using elementary nmnber theory methods, we prove that if a is an odd prime with a≡± 3(mod 8), b has a divisor d with (a/d) = - 1, where (a/d) is the Jaeobi symbol, then the equation has only the solution (a,b,x,y,z) = (11,3,4,5,122) .
出处
《四川师范大学学报(自然科学版)》
CAS
北大核心
2016年第4期528-530,共3页
Journal of Sichuan Normal University(Natural Science)
基金
国家自然科学基金(11226038和11371012)
陕西省教育厅科研计划项目(14JK1311)