Sums + number theory

\[ \text{lcm}(1,77) + \text{lcm}(2,77) + \text{lcm}(3,77) + \cdots + \text{lcm}(77,77) = \, ? \]

Notation: \(\text{lcm}(a,b) \) denote the Lowest Common Multiple of \(a\) and \(b\).

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