1, 3, 7, 17, 21, 51, 119, 357.
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1, 3, 7, 17, 21, 51, 119, 357
Double the last digit. Subtract it from the rest. If the result is divisible by 7, the original number is divisible by 7.
1/3 of 357 is 119.
The LCM of one number is itself, because LCM stands for least common multiple, it usually (in fact almost always) deals with two or more numbers.
17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255, . . .51, 102, 153, 204, 255, 306, 357, 408, 459, 510, 561, 612, 663, 714, 765, . . .