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!! Selfridge check for primes.
!! Checks primes > 500 000, for otherwise it is in prime table.
!set Selfridge_src=Selfridge_table=vector(1000,x,0);\
\
{ Selfridge_check(x)=if(abs(x)<500000,return(1));\
Selfridge_f=factor(x-1);Selfridge_n=matsize(Selfridge_f)[1];\
for(Selfridge_k=1,Selfridge_n,\
Selfridge_p=Selfridge_f[Selfridge_k,1];\
if(Selfridge_p>=500000,\
if(Selfridge_ptr>=999,return(-1));\
Selfridge_ptr++; Selfridge_table[Selfridge_ptr]=Selfridge_p;\
);\
Selfridge_t=0;for(Selfridge_j=2,1000,\
if(Mod(Selfridge_j,x)^(x-1)!=Mod(1,x), return(0));\
Selfridge_d=(x-1)/Selfridge_p;\
if(Mod(Selfridge_j,x)^Selfridge_d!=Mod(1,x),\
Selfridge_t=Selfridge_j;break();\
);\
);\
if(Selfridge_t==0,return(-1));\
); return(1);\
}\
\
{ Selfridge(x)=Selfridge_table[1]=x;\
if(!isprime(x),return(0));\
Selfridge_step=1; Selfridge_ptr=1;\
while(Selfridge_step<=Selfridge_ptr,\
Selfridge_xx=Selfridge_check(Selfridge_table[Selfridge_step]);\
if(Selfridge_xx==0 || Selfridge_xx==-1, return(-1));\
Selfridge_step++;\
); return(1);\
}\
\
selfridge(x)=Selfridge(x);
!exit
:
Selfridge_table=vector(1000,x,0);
{ Selfridge_check(x)=if(abs(x)<500000,return(1));
Selfridge_f=factor(x-1);Selfridge_n=matsize(Selfridge_f)[1];
for(Selfridge_k=1,Selfridge_n,
Selfridge_p=Selfridge_f[Selfridge_k,1];
if(Selfridge_p>=500000,
if(Selfridge_ptr>=999,return(-1));
Selfridge_ptr++; Selfridge_table[Selfridge_ptr]=Selfridge_p;
);
Selfridge_t=0;for(Selfridge_j=2,1000,
if(Mod(Selfridge_j,x)^(x-1)!=Mod(1,x), return(0));
Selfridge_d=(x-1)/Selfridge_p;
if(Mod(Selfridge_j,x)^Selfridge_d!=Mod(1,x),
Selfridge_t=Selfridge_j;break();
);
);
if(Selfridge_t==0,return(-1));
); return(1);
}
{ Selfridge(x)=Selfridge_table[1]=x;
if(!isprime(x),return(0));
Selfridge_step=1; Selfridge_ptr=1;
while(Selfridge_step<=Selfridge_ptr,
Selfridge_xx=Selfridge_check(Selfridge_table[Selfridge_step]);
if(Selfridge_xx==0 || Selfridge_xx==-1, return(-1));
Selfridge_step++;
); return(1);
}
selfridge(x)=Selfridge(x);
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