13, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 156, 169, 182, 195, 208, 221, 234, 247, 260, 273, 286, 299, 312, 325, 338, 351, . . .
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Multiples of 13 include 13, 26, 39 and so on. For them to be common, they need to be compared to another set of multiples.
Factors: 1 and 13 Multiples: 13, 26, 39 and so on.
Since both 11 and 13 are prime numbers, the LCM of these 2 number is 11 * 13 = 143. All multiples of 143 are multiples of 11 and 13 as well
Multiples of 4 are 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52... Multiples of 13 are 13, 26, 39, 52, 65, 78, 91, 104... Common multiples of 4 and 13 are 52, 104, 156...
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