Prime Number Searcher

Bas Rosier Jul 25, 2005

This script will find and display all the prime numbers up to a user-determined number.

The JavaScript Source: Math Related: Prime Number Searcher

Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s). The script is yours!!!

<!-- TWO STEPS TO INSTALL PRIME NUMBER SEARCHER:

1.  Copy the coding into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  -->

<HEAD>

var n = 3;  // number of which is investigated if it is a prime number
var i;      // number of division
var out;    // this equals the division n/i or prm/dlf
var isPriem;  // true when a number is a prime number, otherwise false

function askMax() {
  document.output.outputNumbers.value="";
  max = prompt("Up to what number do you want me to search for prime numbers?","");
  Priem();
}

function Search(prm,dlf) {
  dlf--;
  out = prm/dlf;
  document.output.outputText.value+="\n"+prm+"/"+dlf+"="+out;

if((out!=Math.round(out)) && (dlf>2)) {
    document.output.outputText.value+="\ndlf is nog groter dan twee en er is nog geen ronde uitkomst gevonden";
    Search(prm,dlf);
  }

else if(out==Math.round(out)) {
    document.output.outputText.value+="\nronde uitkomst gevonden";
    isPriem=false;
  }

else if((dlf==2) && (out!=Math.round(out))) {
    document.output.outputText.value+="\ndlf is 2 en er is nog geen ronde uitkomst gevonden";
    isPriem=true;
  }
}
// End -->
</script>
</HEAD>

<BODY>

<div align="center">
<form name="output">
<p>
"1" is not a prime number, even if it's only divisible by 1 and itself. "0" is not a prime number because every result of a division with 0 is 0. Negative numbers behave in the same way positive numbers do. (If you enter a number that is too high, you might get an out of memory error.)</p>

<input type="button" value="Click to Enter a Prime Number" onclick="javascript: askMax();">
<br><br>
<input type="hidden" name="outputText">The prime numbers will be displayed below.<br><br>
<textarea cols="40" rows="5" name="outputNumbers" readonly></textarea>
</form>
</div>

<p><center>
<font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

Did you use this script? Do you like this site? Please link to us!

Leave a Response

(0 comments)

Alphabetical Listing

Tutorials

Ajax Tutorials

Ajax

Buttons

Cookies

CSS

Forms

Games

Generators

Image Effects

Math Related

Miscellaneous

Multimedia

Navigation

Page Details

Password

Snippets

Text Effects

Time & Date

User Details

Prime Number Searcher

Leave a Response

Attention JavaScript Coders

Go Deeper