Eulers criterion says that if p is a prime then ap12 ap mod
Euler\'s criterion says that if p is a prime, then a^(p-1)/2 = (a/p) (mod p). Use successive squaring to compute 11^(1729-1)/2 (mod 1729) and use Quadratic Reciprocity to compute (11/1729).
Solution
Euler\'s criterion says that if p is a prime, then a^(p-1)/2 = (a/p) (mod p).
11^(1729-1)/2 (mod 1729)
a= 11
p=1729
11^(1729-1)/2 (mod 1729) = 11/1729
11/1729=
since 1729=2(mod11) :
(11/1729)=(11/2)=?1
by definition of the Jacobi\'s Symbol:
1729=7?13?19?(11/1729)=(11/7)(11/13)(11/19)=(?(7/11))(2/11)(?(8?/?11))=?1
as 11?
