求救：有沒有好辦法？

來源: 於 2009-10-21 18:36:28 [舊帖] [給我悄悄話] 本文已被閱讀：次

Let Tk = k(k + 1)/2 , k = 1, 2, 3, . . . Prove that there are infinitely many n for which Tn is divisible by the sum of its digits.