1 and 3
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1, 2, 3, 6, 7, 14, 21, 42
21 goes into 136 six times. This can be calculated by dividing 136 by 21, which equals 6 with a remainder of 10. Since we are looking for the whole number of times 21 goes into 136, we ignore the remainder.
6 + n = 21
1 and 3
21 is composite number because it has more than one number that goes into it