How to find first ten prime numbers that are greater than 4?

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Grace
Grace 2014-10-4
编辑： Matz Johansson Bergström 2014-10-4
Hi,
How am I going to make an array that consists of first 10 prime numbers that are greater than 4 as follows?
a=[5 7 11 13 17 19 23 29 31 37]
Thank you.

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Matz Johansson Bergström
You could do it like this
x = primes(100); %pick primes smaller than, say 100
x = x(x>4); %pick the ones larger than 4
x(1:10) %pick the first ten of those
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Matz Johansson Bergström
Matz Johansson Bergström 2014-10-4
编辑：Matz Johansson Bergström 2014-10-4
If you want to pick the first n primes larger than k, then there might be some way to first estimate the upper bounds of the number in the function primes you need, by using the "prime-counting function", see http://en.wikipedia.org/wiki/Prime-counting_function. In this case you also have to account for the shifting of k ofcourse. So it's not trivial in that case.

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