primesum | 🚀 Sum of the primes below x | Math library

by kimwalisch C++ Version: v1.7 License: BSD-2-Clause

X-Ray Key Features Code Snippets Community Discussions(3)Vulnerabilities Install Support

kandi X-RAY | primesum Summary

primesum is a C++ library typically used in Utilities, Math, Example Codes applications. primesum has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

primesum is a command-line program that computes the sum of the primes below an integer x ≤ 1031 as quickly as possible using a modified version of the combinatorial prime counting function algorithm [1]. primesum has already been used to compute many new prime sum world records!. primesum is a modified version of the author's primecount program.

Support

Quality

Security

License

Reuse

Support

primesum has a low active ecosystem.

It has 34 star(s) with 2 fork(s). There are 8 watchers for this library.

It had no major release in the last 12 months.

primesum has no issues reported. On average issues are closed in 0 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of primesum is v1.7

Quality

primesum has no bugs reported.

Security

primesum has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

primesum is licensed under the BSD-2-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

primesum releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

Top functions reviewed by kandi - BETA

kandi's functional review helps you automatically verify the functionalities of the libraries and avoid rework.
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of primesum

Get all kandi verified functions for this library.

primesum Key Features

No Key Features are available at this moment for primesum.

primesum Examples and Code Snippets

No Code Snippets are available at this moment for primesum.

Community Discussions

Trending Discussions on primesum

Summing large primes takes time! How do I make it more efficient?

Why is this simple indexing variable gettng Box-ed in Julia?

Prime Number Correction (2 Arrays)

QUESTION

Summing large primes takes time! How do I make it more efficient?

Asked 2019-Jul-10 at 12:26

I'm trying to complete Project Euler's 10th problem, but the code I currently have takes so much time it hasn't been able to complete.

I've looked around but I haven't been able to find out how to make the code take a shorter time.

This is the code I have:

...

ANSWER

Answered 2019-Jul-09 at 01:20

Some tips to speed up your implementation:

You only have to check for a divisor until the square root of a number, the product of two numbers bigger that it will give a bigger result.
You could also only search for prime divisors, maybe adding the found primes in a list or something like that.

It you want a more efficient algorithm, please checkout https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes

Source https://stackoverflow.com/questions/56944141

QUESTION

Why is this simple indexing variable gettng Box-ed in Julia?

Asked 2018-Apr-25 at 19:36

In solving Problem 10 from Project Euler manually (instead of simply using Primes), I implemented a naive Sieve of Eratosthenes in Julia using BitVector. It produces the correct output, but when I checked its type stability using @code_warntype, I found that i was being allocated as Core.Box, which affects the type of psum, and that in turn throws the type stability of the whole function away. This is the code used:

...

ANSWER

Answered 2018-Apr-25 at 19:36

A temporary solution is to wrap i in let block around the comprehension (I have also proposed some small tweaks in your code that are minor cleanups - I have left creation of multiples_of_i as this was a core of your question but actually using this variable is also inefficient - it would be better to set is_prime_num vector to false in appropriate places using a loop):

Source https://stackoverflow.com/questions/50023146

QUESTION

Prime Number Correction (2 Arrays)

Asked 2017-Apr-25 at 00:49

So essentially what I am trying to do is use one array to populate prime numbers and output the result into a different array. I know I can simply print them out with 2 for loops and use a boolean statement to print the values out, but I really want to do it this way and figure out what I am doing wrong.

...

ANSWER

Answered 2017-Apr-24 at 23:57

A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself.

Source https://stackoverflow.com/questions/43599066

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install primesum

Below are the latest precompiled binaries for Windows, Linux and macOS. These binaries are statically linked and require a CPU which supports the POPCNT instruction (2010 or later).
primesum-1.7-win64.zip, 525 KB
primesum-1.7-linux-x64.tar.xz, 837 KB
primesum-1.7-macOS-x64.zip, 353 KB
You need to have installed a C++ compiler, cmake and make. Ideally primesum should be compiled using a C++ compiler that supports both OpenMP and 128-bit integers (e.g. GCC, Clang, Intel C++ Compiler).

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

Find more information at: