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求救:有没有好办法?

cma 2009-10-21 18:36:28 ( reads)

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.

跟帖(3)

innercool

2009-10-21 19:08:31

One simple argument

cma

2009-10-21 19:37:07

回复:One simple argument

乱弹

2009-10-21 20:13:19

like this one