CINXE.COM
OEIS WebCam
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <html> <head> <link rel="stylesheet" href="/styles.css"> <meta name="format-detection" content="telephone=no"> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <meta name=viewport content="width=device-width, initial-scale=1"> <meta name="keywords" content="OEIS,integer sequences,Sloane" /> <title>OEIS WebCam</title> <link rel="search" type="application/opensearchdescription+xml" title="OEIS" href="/oeis.xml"> <script> var myURL = "\/webcam" function redir() { var host = document.location.hostname; if(host != "oeis.org" && host != "127.0.0.1" && !/^([0-9.]+)$/.test(host) && host != "localhost" && host != "localhost.localdomain") { document.location = "https"+":"+"//"+"oeis"+".org/" + myURL; } } function sf() { if(document.location.pathname == "/" && document.f) document.f.q.focus(); } </script> </head> <body bgcolor=#ffffff onload="redir();sf()"> <div class=loginbar> <div class=login> <a href="/login?redirect=%2fwebcam">login</a> </div> </div> <div class=center><div class=top> <center> <div class=donors> The OEIS is supported by <a href="http://oeisf.org/#DONATE">the many generous donors to the OEIS Foundation</a>. </div> <div class=banner> <a href="/"><img class=banner border="0" width="600" src="/banner2021.jpg" alt="OEIS WebCam"></a> </div> </center> </div></div> <div class=center><div class=pagebody> <div class=searchbarcenter> <form name=f action="/search" method="GET"> <div class=searchbargreet> <div class=searchbar> <div class=searchq> <input class=searchbox maxLength=1024 name=q value="" title="Search Query"> </div> <div class=searchsubmit> <input type=submit value="Search" name=go> </div> <div class=hints> <span class=hints><a href="/hints.html">Hints</a></span> </div> </div> <div class=searchgreet> (Greetings from <a href="/welcome">The On-Line Encyclopedia of Integer Sequences</a>!) </div> </div> </form> </div> <center> <h2 id="heading">The OEIS WebCam</h2> <div class=webcambar> <select id="qtype" onchange="changeset()"> <option value="">All Sequences</option> <option value="keyword:nice" selected>Best Sequences</option> <option value="keyword:more">Sequences Needing More Terms</option> <option value="keyword:new">Recent Additions</option> <option value="keyword:uned">Unedited Sequences</option> </select> <select id="reload" onchange="changetime()"> <option value="0">when I say so</option> <option value="5">reload every 5 seconds</option> <option value="10">reload every 10 seconds</option> <option value="20" selected>reload every 20 seconds</option> <option value="30">reload every 30 seconds</option> <option value="60">reload every minute</option> </select> <div class=webcamspace></div> <input type="button" value="Stop Camera" onclick="stoptimer()" id="stop-button"/> <div class=webcamspace></div> <div class=countdown><span id=countdown></span></div> </div> <div class=seqwin> <div id=seqwin></div> </div> <p id="debug"> </p> <script type="text/javascript"> var camtimer var refreshtime var seqset var xmlreq = null var dodebug = 0 var stopisnext = 0 function now() { var t = new Date() return t.getTime() } function starttimer() { camtimer = 0 if(refreshtime > 0){ debug("start timer for "+refreshtime+"\n") camtimer = now()+refreshtime*1000 debug("camtimer = "+camtimer+"\n") countdown(refreshtime) }else countdown("") } function stoptimer() { if(stopisnext){ seqload() return } camtimer = 0 countdown("") var t = document.getElementById("reload") t.selectedIndex = 0 changetime() } function changetime(x) { var t = document.getElementById("reload") refreshtime = t.value debug("change time to "+t.value+"\n") var b = document.getElementById("stop-button"); if(t.value != 0 && stopisnext){ stopisnext = 0 b.value = "Stop Camera" }else if(t.value == 0 && !stopisnext){ stopisnext = 1 b.value = "Next Sequence" } starttimer() } function changeset() { var t = document.getElementById("qtype") seqset = t.value var h = document.getElementById("heading") var o = t.options[t.selectedIndex] debug("change sequence set to "+t.value+"\n") h.innerHTML = "The OEIS WebCam: "+o.text seqload() } function seqload() { debug("seqload\n") camtimer = 0 var u = window.location u = u+"?fromjavascript=1&q="+seqset+"&random="+Math.random() startxmlreq(u) } function countdown(s) { var t = document.getElementById("countdown") t.innerHTML = "<font size=-1>"+s+"</font>" } function tick() { if(camtimer){ var d = (camtimer - now())/1000 d = d-d%1 if(d > 0) countdown(d) else{ countdown("") camtimer = 0 seqload() } } setTimeout("tick()", 250) } function xonload() { debug("onload\n") changetime() camtimer = 0 countdown("") changeset() setTimeout("tick()", 250) } function startxmlreq(url) { var r debug("startxml "+url+"\n") if(window.XMLHttpRequest){ r = new XMLHttpRequest() xmlreq = r r.onreadystatechange = xmlupdate r.open("GET", url, true) r.send(null) }else if(window.ActiveXObject){ r = new ActiveXObject("Microsoft.XMLHTTP") xmlreq = r if(r){ r.onreadystatechange = xmlupdate r.open("GET", url, true) r.send() } } return r } function xmlupdate() { var r r = xmlreq if(!r) return if(r.readyState == 4 && r.status == 200){ debug("got xml\n") var t = document.getElementById("seqwin") t.innerHTML = r.responseText starttimer() } } function debug(s) { if(!dodebug) return var t = document.getElementById("debug") t.innerHTML = t.innerHTML + s + "<br>" } xonload() </script> </div></div> <p> <div class=footerpad></div> <div class=footer> <center> <div class=bottom> <div class=linksbar> <a href="/">Lookup</a> <a href="/wiki/Welcome"><font color="red">Welcome</font></a> <a href="/wiki/Main_Page"><font color="red">Wiki</font></a> <a href="/wiki/Special:RequestAccount">Register</a> <a href="/play.html">Music</a> <a href="/plot2.html">Plot 2</a> <a href="/demo1.html">Demos</a> <a href="/wiki/Index_to_OEIS">Index</a> <a href="/webcam">WebCam</a> <a href="/Submit.html">Contribute</a> <a href="/eishelp2.html">Format</a> <a href="/wiki/Style_Sheet">Style Sheet</a> <a href="/transforms.html">Transforms</a> <a href="/ol.html">Superseeker</a> <a href="/recent">Recents</a> </div> <div class=linksbar> <a href="/community.html">The OEIS Community</a> </div> <div class=linksbar> Maintained by <a href="http://oeisf.org">The OEIS Foundation Inc.</a> </div> <div class=dbinfo>Last modified April 5 01:32 EDT 2025. 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