I think you mean some common multiples. Since 17 is prime, there are no common factors of 17 and 21. Now the first common multiple will be 21x17. You can use more 21s or more 17s to find additional multiples. Here is one 17x21x21 Here is another 17x17x21
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There are 71 multiples altogether here. Some of them are 7, 14, 21.
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
The first 3 multiples of 17 are: 17, 34, 51
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
The first 3 COMMON multiples of 17 will depend upon the OTHER NUMBER(S) with which 17 has common multiples. However, they will be regularly spaced within the multiples of 17.eg the first 3 COMMON multiples of:1 and 17 are 17, 34, 51;2 and 17 are: 34, 68, 102;5 and 17 are: 85, 170, 255;17 and 34 are: 34, 68, 102etc.