The total number is infinite. The first 10 are:
294, 588, 882, 1176, 1470, 1764, 2058, 2352, 2646, 2940 . . .
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The first 15 multiples of 279:
279, 558, 837, 1116, 1395, 1674, 1953, 2232, 2511, 2790, 3069, 3348, 3627, 3906, 4185 . . . ∞
These are the first ten multiples of 399
399, 798, 1197, 1596, 1995, 2394, 2793, 3192, 3591, 3990, ...
The factor pairs of 294 are (294, 1) (147, 2) (98, 3) (49, 6) (42, 7) (21, 14) None of them add up to 7. If that was -294, you could use 21 and -14
49, 98, 147, 196, 245, 294, 343, 392, 441, 490.
84, 168, 252, 336, 420, 504, 588, 672147, 294, 441, 588, 735Common multiples include 588, 1176, 1764 and so on.
Yes, 7 is a factor of 294.
The multiples of 7 between 200 and 400 are: 203, 210, 217, 224, 231, 238, 245, 252, 259, 266, 273, 280, 287, 294, 301, 308, 315, 322, 329, 336, 343, 350, 357, 364, 371, 378, 385, 392, 399. The sum of all the multiples of 7 between 200 and 400 is 8,729.