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1, 7, 17, 49, 119, 833.
The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.The least common multiple of 7 and 119 is 119.
There is no such number. Once you have one n-digit number which is divisible by 4 then 10 times that number will be an n+1 digit number which is divisible by 4. And this process can continue ad infinitum.
1 x 2499, 3 x 833, 7 x 357, 17 x 147, 21 x 119, 49 x 51, 51 x 49, 119 x 21, 147 x 17, 357 x 7, 833 x 3, 2499 x 1.
1, 7, 17, 23, 49, 119, 161, 343, 391, 833, 1127, 2737, 5831, 7889, 19159, 134113 7, 17 and 23 are prime.