reserve X for set;
reserve a,b,c,k,m,n for Nat;
reserve i,j for Integer;
reserve r for Real;
reserve p,p1,p2 for Prime;

theorem Th23:
  n divides 362 implies n = 1 or n = 2 or n = 181 or n = 362
  proof
    362 = 2*181;
    hence thesis by Lem2,XPRIMES1:2,181;
  end;
