How can I find all numbers dividable by let's say 5,7,13 that are 2007***
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Welcome to MSE. Please read this text about how to ask a good question. – José Carlos Santos Jan 25 '20 at 10:17
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The number must also be divisible by the least common multiple of $5,7,13$, which is just their product. Now write $2017{*}{*}{*}=2017000+x$ with $0\le x\le 999$, and compute the remainder of division by $5\cdot7\cdot 13$.
Hagen von Eitzen
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