The difference between the sum of the...

The difference between the sum of the first `k` terms of the series `1^3+2^3+3^3++n^3` and the sum of the first `k` terms of `1+2+3++ni s1980.` The value of `k` is __________.

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The difference between the sum of the first `k` terms of the series `1^3+2^3+3^3++n^3` and the sum of the first `k` terms of `1+2+3++ni s1980.` The value of `k` is __________.

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