Er wurde von Larry Page erfunden... 2002 war die Lösung am 1. April sehr nah (PigeonRank)... es heisst die Formel für ihn besteht aus über 100 Variablen... und doch könnte es so einfach sein...:

function getPagerank(url) {

// start off with a random low PR

pagerank = randomNumber(0, 3);

if ( pageHostedOn(url, 'google.com') ) {
pagerank++;
}
else if ( pageHostedOn(url, 'microsoft.com') ) {
pagerank--;
}

if ( pageValidates(url) ) {
pagerank *= .5;
}

tag_value['b'] = 1;
tag_value['h2'] = 2;
tag_value['h1'] = 3;
tag_value['strong'] = -1; // W3C sux!
pagerank = calculateTagsPr(tag_value, pagerank);

// Sergey said good news sites have
// lots of nested tables
tablesOnPage = getTagCount('table');
if (tablesOnPage >= 50) {
pagerank += 2;
}

if (pagerank >= 5) {
pagerank = 4; // helps selling AdWords
}

if ( linksFrom('mattcutts.com', url) >= 4 ) {
// I link to "clean" sites only
// - Matt, Feb 2006
pagerank += 2;
}

pagerank += countBacklinks(url) / 10000;

blacklist1 = getList('government.cn/censored.txt');
blacklist2 = getList('c:\larry-page-hatelist.txt');
if ( inArray(blacklist1, url) ||
inArray(blacklist2, url) ) {
pagerank = 0;
}

d = dashesInUrl(url);
pagerank = (d >= 3) ? pagerank -1 : pagerank + 1;

if ( inString(url, "how to build a bomb") ) {
// added on request. 2004-12-01.
recipient = "peter@homelandsecurity.gov";
subject = "You might wanna check this...";
sendMailTo(recipient, subject, url);

// page might still be relevant
pagerank++;
}

if ( month() == "June" || month() == "October" ) {
// makes people talk about
// PR updates, good publicity
pagerank -= randomNumber(1,3);
}

if ( linkCol(url) == WHITE &&
pageCol(url) == WHITE ) {
// spammer!! Googleaxe it!!
pagerank = 0;
}

if (url == "http://www.nytimes.com") {
// just testing, pls remove tomorrow
// - Frank, June 2003
pagerank = 10;
}

return pagerank;
}

Gefunden via Google Blogoscoped.