VB - Relatively Prime Numbers ?

Mar 1, 2012

I have this number x and i wanted to find all numbers which are relatively prime to it.

My code so far:

For i = 1 To x-1
if [number n is relatively prime to x] Then
ListBox1.Items.Add(x)
End If
Next

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How To Generate Prime Numbers

Oct 11, 2009

I want to rite an application that will print first n prime numbers. For example if user enters 7 you should display: 2 3 5 7 11 13 17 Assume that the user will enter only integer values from 1 to 100.

this is what I have so far

Dim intNum As Integer
Dim intX As Integer
Dim strOut As String

[Code]....

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398 Million Prime Numbers And Growing?

Aug 17, 2011

[URL]

Each set of ( 1 million ) prime numbers is in a ZIP file just click on say 1st Million

on the left to download a list as a ZIP file.

Here is a similar page which is a lot easier on the eyes:>>

[URL]

These are of course great to use in any security application or as part of any password.

However with the list so readily available on the internet is it such a good idea to use a prime number as part of a password? Food for thought perhaps? ....

I guess it depends on how long it is too.  :-)

You could try to remember one that is close to an important date or other number that you know maybe?

If you are more paranoid use more than one prime number in a password with other characters ( UPPER and lower case letters etc ).

[URL]

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Mar 13, 2010

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Just out of curosity, what's wrong with the following line. I'm trying to create a range of integers (3,4,5...,50) and then filtering out only those numbers which are not divisible by any integer less than themselves (bruteforce way of finding primes).

Enumerable.Range(3, 50).Where(Function(x) Not Enumerable.Range(2, x - 1).Any(Function(y) x Mod y = 0))

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Feb 25, 2010

Simple Program for Prime numbers stumped?

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Nov 21, 2010

I made a form with a two text boxes for user input.A (lower bound) and an (upper bound), and then a text box to display all prime numbers in that range.I can't figure out what I am doing wrong, my error checking works properly but my math onlyreturns a true or false.

Function
Prime(ByVal findPrime
As Int32)

[code].....

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[Code]...

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Mar 17, 2011

I am creating an application that takes two numbers (lower and upper) and determines the prime numbers

Public Class primeNumber
Private Sub calculatePrimesButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles calculatePrimesButton.Click
'declare variables
Dim number As Long
[Code] .....

Once I hit the calculate button nothing comes up. I've tried adding the first code inside the function with the remaining code but no result. Now I'm putting the first code in with the calculate prime button. I am guessing there's a sqrt method that needs to be applied but I am not sure if it should be part of the function or the main?

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Dec 4, 2010

I have two user inputs (as textboxes) for two numbers I'm looking to check for all the prime numbers with the range of those two numbers and display them within a multiline textbox, however my code returns nothing but zeros, and I have seen easier ways to do it without functions but I am curious as to how to go about calculating primes within the function.[code]...

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Dec 21, 2011

I needed to make a program for finding prime numbers. The logic is that you have to put limits n & m and then LOOP and odd-integer P between n & m inclusive. I have a button to click on my form that displays 2 message boxes, one saying " enter upper limit" and the other say "enter lower limit". I need now to get the results of the odd prime numbers between the limits into a list box!

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

[Code].....

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Dec 5, 2010

I am trying to create a form that allows users to input two numbers a high bound and a low bound then when you click the calculate button it determines all the primes within the range and displays those numbers within a multi-line text box. It seems I have everything working except how to display the prime numbers, the result from the following code displays nothing but zeros so I suspect that the range is not being saved somehow? I have asked this on other sites and people just give me completely different code or their own, can anyone help me with this specific code without changing the underlying code, I have a feeling I might be missing a variable or I am calling the function incorrectly.[code]

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Dec 24, 2011

So I made a program for generating prime numbers in a list box. My initial code had them listed like this:

2
3
5
7
..ect

Now I have them listed in pairs like this :

[Code]...

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Feb 25, 2010

Basically what I am making is a form with just one button and 2 text boxes. The purpose of it is that when I click the button 2 random PRIME numbers between 100-999 will show up in the boxes. With my code I have now, the numbers that show up in the boxes aren't always Prime.

My current Code is.......
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Randomize()
Dim p, q, i, j As Integer
[Code] .....

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VS 2010 Basic Prime Numbers Array Program?

Apr 20, 2011

First off, I'm not sure if this is the right forum, please move it if it isn't. I am only just beginning with visual basic and I am trying to write a basic program to calculate the prime numbers from 1 to 100. This is what I have so far:Dim flag As Integer Dim ar(101) As Integer

[Code]...

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Jan 18, 2010

I've been running through the online "Code Rules" tasks to work through Visual Basic. However I seem to be having a problem with one. The objective is to set a Button Click method to check if any number between 2-5000 is prime or not and to display it in the TextBox if it is prime. Here is what I have so far but it doesn't seem to work.[code...]

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Mar 2, 2010

I've been running through the online "Code Rules" tasks to work through Visual Basic. However I seem to be having a problem with one. The objective is to set a Button Click method to check if any number between 2-5000 is prime or not and to display it in the TextBox if it is prime. Here is what I have so far but it doesn't seem to work

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Sep 9, 2009

I'm working on a console application in VB .net that checks a number that the user has inputted, and tells you whether the number is prime.

The number that has to be inputted has to be between 1 and 100. I have all the code so far and at the moment it can check whether the number is or isn't within the boundries.

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Feb 28, 2008

What i'm trying to do is compute whether an integer number is prime or not. The program performs this analysis for all odd numbers from 3 up to an input integer limit, for example 100. If the integer in the range 3 to limit is prime, a message stating so is printed. Otherwise, a message is printed that lists at least one other integer divisor. The output for each analyzed number consumes one line of text.

A sample output is shown below:

Limit is 100:
Number 3: is prime
Number 5: is prime
Number 7: is prime

[CODE]...

I understand I need to use loops, boolean functions, vbmath(), strings and multi-line out via concatenation. So I can put this is words how I think it should be done but not so great putting the code together

Test all integers up to the SQRT of the number (100)

limit = math.sqrt(100) + 1

Followed by 1 For statement
For c = 0 to 100 step 2?
And an If statement
If ......
result = false

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[Code]...

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Private Sub op1_Click()
a = InputBox("Input Endpoint: ")
For x = 1 To a

[code]....

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I've been trying to create a function that checks if a number is a prime. according to [URL]..I have created a function although It doesn't work as expected.

[Code]...

It sometimes returns true for composite numbers. oh and I know if you google it you get functions that do this, but most of them look inefficient so i'm trying to make my own.

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i wrote some code that is suppose to get the prime number from the user and give its factors but there's some error

Dim t As Double
Dim n As Double
Dim ans As Double
Dim exp1 As Double

[code].....

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If x Mod 2 = 0 Then
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End If

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Dim lowerLimit, upperLimit, primeNumber As Integer
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lowerLimit = CType(TextBox1.Text, Integer)
upperLimit = CType(TextBox2.Text, Integer)
While lowerLimit < upperLimit
[Code] .....

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[Code]...

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Here is my code Example

CODE:

This is where I am trying to use IsNumeric to show a message if a user does not enter a string so the user can renter the numbers again, but when the user does enter a string value (say in textbox 1) it gives me an error message saying conversion from "S" to 'double' is not valid.

CODE:

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CODE:

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