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.
innercool
2009-10-21 19:08:31One simple argument