231, 252, 273, 294, 315, 336, 357, 378, 399, 420, 441, 462, 483, 504, 525, 546, 567, 588, . . .
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The Least Common Multiple of 21 and 30 is 210.
There are an infinite number of common multiples of 21 and 15 .The smallest two of them are 105 and 210 . A couple of others are 1,890 and 453,705 .
21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, . . .
21, 42, 63, 84, 105, 126, 147, 168, 189, 210 and just keep adding 21 until you get to 987.
21,42,63,84