I recently read about a faster implementation of Segmented Sieve of Eratosthenes for really big numbers. Following is an implementation of the same: function sieve(low, high) { var primeArray = [], ll = Math.sqrt(low), output = []; for (v...

My problem is to compute (g^x) mod p quickly in JavaScript, where ^ is exponentiation, mod is the modulo operation. All inputs are nonnegative integers, x has about 256 bits, and p is a prime number of 2048 bits, and g may have up to 2048 bits. Most...

Input: 13195 Expected Result: 29 (largest prime factor of input) Actual Result: 2639 (largest factor of input, but not a prime number) I didn't bother with even numbers because the largest prime will either be 2 or some odd prime multiplied by 2...

I have been trying to write Sieve of Eratosthenes algorithm in JavaScript. Basically I just literally followed the steps below: Create a list of consecutive integers from 2 to (n-1) Let first prime number p equal 2 Starting from p, count up in incr...

I am trying to determine whether the value in a text box is prime or not using jQuery. Here is what I've tried so far, but it's not working: $("#textbx").keyup(function(){ if ($("#textbx").val().length > 0) { $("...

And how can I correct them to work? I am trying to optimize my sieve per previous suggestions, but in both instances the code breaks: Incrementing j = j + ( i * 2) will break the code. Obviously I'm missing some concept on optimizations as well...

I have an input field to take a maximum number and find all smaller prime numbers. It should return to an array and display the array with an alert. Except I'm getting blank every time. HTML: <p>Please enter the maximum number you'd...

So I wanted to write a function that returns the sum of all prime numbers up to and including a provided number. I have written this, which works: function sumPrimes(num) { const arr = Array.from({length: num+1}, (v, k) => k).slice(2); re...

I found this code online. It is not my own. This is a function to test whether a given number is prime or not. The code works in determining whether a number is prime or not. I just don't understand how it works. function test_prime(n) {...

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