406, 413, 420, 427, 434, 441, 448, 455, 462, 469, 476, 483, . . . .
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Smallest multiple of 7 greater than 100 is 15 Largest multiple of 7 less than 1000 is 142 So number of multiples of 7 = 142 - 15 + 1 = 128
4,8,12,16,20
... 7 x 30 = 210, that should give you a clue...
15
21 and 28 are the two multiples.