The positive integer multiples of 7 with products up to 420 are:
1 x 7 = 7
2 x 7 = 14
3 x 7 = 21
4 x 7 = 28
5 x 7 = 35
6 x 7 = 42
7 x 7 = 49
8 x 7 = 56
9 x 7 = 63
10 x 7 = 70
11 x 7 = 77
12 x 7 = 84
13 x 7 = 91
14 x 7 = 98
15 x 7 = 105
16 x 7 = 112
17 x 7 = 119
18 x 7 = 126
19 x 7 = 133
20 x 7 = 140
21 x 7 = 147
22 x 7 = 154
23 x 7 = 161
24 x 7 = 168
25 x 7 = 175
26 x 7 = 182
27 x 7 = 189
28 x 7 = 196
29 x 7 = 203
30 x 7 = 210
31 x 7 = 217
32 x 7 = 224
33 x 7 = 231
34 x 7 = 238
35 x 7 = 245
36 x 7 = 252
37 x 7 = 259
38 x 7 = 266
39 x 7 = 273
40 x 7 = 280
41 x 7 = 287
42 x 7 = 294
43 x 7 = 301
44 x 7 = 308
45 x 7 = 315
46 x 7 = 322
47 x 7 = 329
48 x 7 = 336
49 x 7 = 343
50 x 7 = 350
51 x 7 = 357
52 x 7 = 364
53 x 7 = 371
54 x 7 = 378
55 x 7 = 385
56 x 7 = 392
57 x 7 = 399
58 x 7 = 406
59 x 7 = 413
60 x 7 = 420
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7, 14, 21 and just keep adding 7 until you get to 294.
Oh, dude, you want common multiples of 3 and 7 up to 100? Well, let me break it down for you. The common multiples of 3 and 7 are numbers that both 3 and 7 can divide evenly into. So, the common multiples of 3 and 7 up to 100 are 21, 42, 63, and 84. Like, that's it.
406, 413, 420, 427, 434, 441, 448, 455, 462, 469, 476, 483, . . . .
4,8,12,16,20
All multiples of 7, which is an infinite number.