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

Question

Grace 2014-10-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157342-how-to-find-first-ten-prime-numbers-that-are-greater-than-4

编辑： Matz Johansson Bergström 2014-10-4

采纳的回答： Matz Johansson Bergström

在 MATLAB Online 中打开

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.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matz Johansson Bergström 2014-10-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157342-how-to-find-first-ten-prime-numbers-that-are-greater-than-4#answer_153877

在 MATLAB Online 中打开

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

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

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.

请先登录，再进行评论。