Sums + number theory

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

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

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