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Update math/lcm_sum.cpp

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Co-authored-by: Krishna Vedala <7001608+kvedala@users.noreply.github.com>
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math/lcm_sum.cpp
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/**
* @file
* @brief An algorithm to calculate the sum of LCM: \f$\mathrm{LCM}(1,n) + \mathrm{LCM}(2,n) + .. + \mathrm{LCM}(n,n)\f$
* @brief An algorithm to calculate the sum of LCM: \f$\mathrm{LCM}(1,n) + \mathrm{LCM}(2,n) + \ldots + \mathrm{LCM}(n,n)\f$
* @details An algorithm to calculate the sum of LCM: \f$\mathrm{LCM}(1,n) + \mathrm{LCM}(2,n) + .. + \mathrm{LCM}(n,n)\f$ where \f$\mathrm{LCM}(i,n)\f$
* denotes the Least Common Multiple of the integers i and n. For n greater than or equal to 1.
* The value of the sum is calculated by formula: