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            <p><a href="https://projecteuler.net/index.html?section=problems&amp;id=8">Problem number 8 on project Euler</a> is the easiest of the 150 problems listed there. Your don't really need any code to solve it. You can just to a simple text search and come up with the answer. In case you are too lazy to do that. Here is the solution:</p>
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                <pre>$str="73167176531330624919225119674426574742355349194934".<p></p><p>"96983520312774506326239578318016984801869478851843".</p><p>"85861560789112949495459501737958331952853208805511".</p><p>"12540698747158523863050715693290963295227443043557".</p><p>"66896648950445244523161731856403098711121722383113".</p><p>"62229893423380308135336276614282806444486645238749".</p><p>"30358907296290491560440772390713810515859307960866".</p><p>"70172427121883998797908792274921901699720888093776".</p><p>"65727333001053367881220235421809751254540594752243".</p><p>"52584907711670556013604839586446706324415722155397".</p><p>"53697817977846174064955149290862569321978468622482".</p><p>"83972241375657056057490261407972968652414535100474".</p><p>"82166370484403199890008895243450658541227588666881".</p><p>"16427171479924442928230863465674813919123162824586".</p><p>"17866458359124566529476545682848912883142607690042".</p><p>"24219022671055626321111109370544217506941658960408".</p><p>"07198403850962455444362981230987879927244284909188".</p><p>"84580156166097919133875499200524063689912560717606".</p><p>"05886116467109405077541002256983155200055935729725".</p><p>"71636269561882670428252483600823257530420752963450";</p><p>echo strlen($str) . "n";</p><p>$max =0;</p><p>for($I=0; $i &lt; 1000; $i++)</p><p>{</p><p>$a1 = (int)substr($str,$i,1);</p><p>$a2 = (int)substr($str,$i+1,1);</p><p>$a3 = (int)substr($str,$i+2,1);</p><p>$a4 = (int)substr($str,$i+3,1);</p><p>$a5 = (int)substr($str,$i+4,1);</p><p>$product = $a1*$a2*$a3*$a4*$a5;</p><p>//	echo "$a1 $a2 $a3 $a4 $a5n";</p><p>if($max &lt; $product) {</p><p>$max = $product;</p><p>echo "New max = $maxn";</p><p>}</p><p>}</p><p>echo $max;</p></pre>
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Product of Consecutive digits.

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            <p></p>
            <p>When it comes to factorials Mysql struggles. Really struggles. Nothing is impossible but it certainly isn't easy to calculate values larger than 50! with mysql. So how does it's good friend PHP fare? Amazingly well. Using the arbitrary precision math (BCMath) functions of PHP you can calculate factorials at the drop of a hat. It's blistering speed is a pleasent surprise.</p>
            <p>Using the arbitary precision math library. You can solve <a href="https://projecteuler.net/index.html?section=problems&amp;id=20">problem 20</a> at project Euler in the blink of an eye. Here is the code.</p>
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Factorials and PHP

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            <p>Factorials as we all know can be defined as</p>
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Mysql and Factorials

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            <p><a href="https://en.wikipedia.org/wiki/Leonhard_Euler">Euler</a> is my favourite mathematician so I sat up and took notice when I stumbled across a site named <a href="https://projecteuler.net/index.html?section=about">project euler</a></p>
            <p>On that site they have listed series of problem that calls for a combination of programming and mathematical skills to solve. I immediately went to work and with in a few hours managed to solve 10 of the problems. But argubly they are not the most difficult ones on show.</p>
            <p>These 10 problems were solved using PHP that would surprise many and offend purists that insists that fortran is the best language to solve numerical problems. That maybe so but I don't have a Fortran development environment set up on my computer and besides it's more than 6 years since I last coded in Fortran. But a time will come for that.</p>
            <p>PHP was chosen because it's so easy to work with and well it's the language of choice for me for most things. However some of the problems obviously cannot be solved easily with PHP and for that I will be forced to use other languages so I might end up coding in Fortran during the next few days.</p>

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Project Euler

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            <p>I am working again on my on again off again log analysis tool. The last release was about an year ago. Way too long. But this project is a lot of hard work and it's got a massive of a database component which I loath to tackle. But despite my lethargy, involvement in other projects and constant side tracking (all my own faults), I have made some progress and plan to make a new release with in the next few days.</p>
            <p>Interestingly enough, when I first <a href="000759.html">applied for the logmine name on sourceforge</a> it was taken by a squatter. That was about two years ago. Upto this date they have not released anything or even made a single commit.</p>
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Log Mine.

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            <p>After switching from Adsense to Adbrite and even putting up an adbrite button on my site, I was rather disappointed. But things seem to be changing.</p>
            <p>In recent weeks I have started getting a few cents a day from adbite. That's right a few cents a day. It's nothing to write home about, but you would write anyway if your adsense earnings were even lower. And the trend with adbrite seem to be upwards where as adsense was stuck in the same rut for years. Even though the amount of traffic to this site continues to grow (albeit slowly) the revenue from adsense never grew.</p>
            <p><a href="http://www.adbrite.com/mb/landing_both.php?spid=45610&amp;afb=120x60-1-blue"></a></p>
            <p><a href="http://www.adbrite.com/mb/landing_both.php?spid=45610&amp;afb=120x60-1-blue"><img align="right" alt="" border="0" src="http://files.adbrite.com/mb/images/120x60-1-blue.gif" style="margin-left:10px"></a> Some of the shortcomings of adbrite (the lousy directory for example) remain but they have attended to one of my gripes. The referral links didn't seem to be working properly. That is I was not getting the dues from an advertiser that I referred. But after about three weeks and two emails (which were not answered) they have put that right. So the adbrite button goes back up.</p>
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Monthly Archives for 2007 04

Product of Consecutive digits.

Factorials and PHP

Mysql and Factorials

Project Euler

Log Mine.

Adbrite Revisited.