\(已知：\frac{10^k－1}{11m}＝ft，求证：f＝y\)

太阳

素数\( m＝18a+1\)，\( t＝18c+1\)，\({10^k+1\over 11}\)＝\( mt\)，没有找到\( m\)和\( t\)两个素数乘积

太阳

k＝239，(10^239+1)/11＝508399838327574001×2846390188891241030645451773087716881978563746547069042984813032147999326242449×6282138071505210318841228543562283508437569619884438177000652801796615935488955777747431198279234592543622766101015393665597896857185313159459