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24756Re: single frobenius and double fermat

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  • paulunderwooduk
    Dec 11, 2012
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      --- In primenumbers@yahoogroups.com, "paulunderwooduk" <paulunderwood@...> wrote:
      >
      >
      >
      > --- In primenumbers@yahoogroups.com, "djbroadhurst" <d.broadhurst@> wrote:
      >
      > > fooled
      >
      > Thanks David. However, I am going to be even more devious with this 3.5 selfridge test for small x:
      >
      > {tst(n,x)=kronecker(x^2-4,n)==-1&&gcd(x,n)==1&&
      > Mod(4*(x-2),n)^((n-1)/2)==kronecker(x-2,n)&&
      > Mod(4*(x+2),n)^((n-1)/2)==kronecker(x+2,n)&&
      > Mod(Mod(1,n)*2*(L^2-4),L^2-x*L+1)^(n+1)==4*(25-4*x^2);}
      >

      Maybe I can make this 3.125 selfridge for small x by removing the first multiplier 4 and using x=1,3 and 6 where possible

      Paul
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