What you are looking for is the Common Factor/Divisor. In this case, because both 7 and 13 are prime numbers, the answer is 1. But this is often considered a trivial factor since it is a common factor of all integers.
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There are an infinite number of multiples of 9 and 7. The lowest of which (least common multiple) is 63.
Since 7 and 13 are both prime numbers, only their product or one of its multiples can be divided by both of them.
1, 7, 13, 91.
If you mean 2, 3 and 7 as factors then the smallest number is 42
The only number is 1. But if you are looking for number that they each go into, the smallest number is 210.
The least common multiple (LCM) of 7, 8, and 13 is the smallest multiple that all three numbers share. To find the LCM, you first need to find the prime factorization of each number: 7 is a prime number, 8 = 2^3, and 13 is also a prime number. Then, you take the highest power of each prime factor that appears in any of the numbers, which gives you 2^3 * 7 * 13 = 364. Therefore, the least common multiple of 7, 8, and 13 is 364.
If the primes are of multiplicity 1, then the answer is 30030. Otherwise it is 64.