Program In_so_nguyen_to;
uses crt;
var n, i: integer;
{——Ham kiem tra——-}
Function kiem_tra(n:integer):boolean;
var i: integer;
begin
kiem_tra:=true;
for i:=2 to n-1 do if (n mod i) = 0 then kiem_tra:=false;
end;
{——CTC—————-}
begin
clrscr;
write(‘Nhap n: ‘); readln(n);
for i:=2 to n do if kiem_tra(i) then write(i:3, ‘, ‘);
readln;
end.