theorem Th8:
  7|^10+1 = (2824*10000+7525) * 10 :: 282 475 250
  proof
    thus 7|^10+1 = 7*7*7*7*7*7*7*7*7*7+1 by NUMBER02:6
    .= (2824*10000+7525) * 10;
  end;
