for j:=2 to x div 2 do if x mod j=0 then c:=c+1

program sierpinski;

uses wincrt;

var

ch:string;

k,i:integer;

function premier(x:integer):boolean;

var

j,c:integer;

begin c:=0;

for j:=2 to x div 2 do if x mod j=0 then

c:=c+1;

premier:=(c=0) and (x<>1) ; end;

function puis(x,y:integer):integer;

var

r,i:integer;

begin r:=1;

for i:=1 to y do r:=r*x;

puis:=r;

end;

procedure sierpins(k:integer);

var

n,i:integer;

begin

for i:=1 to 10 do begin

n:=k*puis(2,i)+1;

if premier(n) then

writeln(k:2,i:4,N:7,'Premier':12);

end;

end;

procedure saisie(var k:integer);

begin

k:=random(5)+1;

end;

begin

randomize;

saisie(k);

writeln('k':2,'i':4,'N':7);

sierpins(k);

end.