theorem Th10:
  9|^10+1 = (3486*100+78)*10000+4402 :: 3 486 784 402
  proof
    thus 9|^10+1 = 9*9*9*9*9*9*9*9*9*9+1 by NUMBER02:6
    .= (3486*100+78)*10000+4402;
  end;
