115, 230, 345 and so on.
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The prime numbers: 19, 23, 29 and 61.
19 and 23
23 is prime. Prime numbers don't have proper factors.
You need at least two numbers to find a GCF.
The LCM or least common multiple is 253. In this case, the greatest common factor of the two numbers is 1. That is to say, they have no other common factors. We call these numbers relatively prime. When two numbers are relatively prime their LCM is always the product of the two numbers.Sometimes it is easier to find the greatest common factor than to find the least common multiple by looking at multiples of both numbers. This is true if the numbers are primes like 11 and 23. So if you are give two primes, the LCM will always be the product of the two numbers.