function [x, xp]= Successione(x0,x1,epsi,n)
x(1)=x0;
x(2)=x1;

xp(1)=x0+epsi;
xp(2)=x1+11*epsi;

for k=2:n
    x(k+1)=122/11*x(k)-x(k-1);
    xp(k+1)=122/11*xp(k)-xp(k-1);    
end


