Hola, escribo lo siguiente en Magma:
TwinCounter:=function(n);
L:=[[p,p+2]: p in [1..n-2] | TwinPrime(p)];
return #L;
end function;
TwinCounter(100);
Pero me arroja error, no se cual es el problema...

An error occurred. See the output for details.
>> L:=[[p,p+2]: p in [1..n-2] | TwinPrime(p)];
^
User error: Identifier 'TwinPrime' has not been declared or assigned
>> TwinCounter(100);
^
User error: Identifier 'TwinCounter' has not been declared or assigned