Question 852671: I am trying to find the intersection of the sets of types of primes and so I am going up to 12 digit primes to be sure I find an intersection. I need the first 12 digit multiples of:
3, 4, 5, 6, and 7
Answer by Edwin McCravy(20064)   (Show Source):
You can put this solution on YOUR website!
I'll just do the one for 7. The others are done exactly
the same way:
To find the smallest 12 digit multiple of 7,
Let the number to multiply 7 by to get a 12-digit
number be n. Then
7n ≧ 100000000000
Divide both sides by 7
n ≧ 14285714285.714···
[if you need a calculator that shows that many digits,
there is one online here: http://web2.0calc.com/ ]
The smallest integer n that fits that is
n = 14285714286
Answer: 7×14285714286 = 100000000002
Repeat the above procedures with 3,4,5, and 6 to get the others.
Edwin
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