求救：有没有好办法？

来源: 于 2009-10-21 18:36:28 [旧帖] [给我悄悄话] 本文已被阅读：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.