AMC 10 Step by Step
2022 AMC 10AProblem 19P16-20~6 minPrint

Define LnL_n as the least common multiple of all the integers from 11 to nn inclusive. There is a unique integer hh such that 11+12+13++117=hL17\frac{1}{1}+\frac{1}{2}+\frac{1}{3}+\cdots+\frac{1}{17}=\frac{h}{L_{17}} What is the remainder when hh is divided by 1717 ?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.