Does it have convergent subsequence in that form?
What is the value of $\sum\limits_{i=1}^\infty\frac{1}{p_{p_i}}$ where $p_{i}$ is the $i$th prime?
Leave newlines intact in bounty messages How do I update Ubuntu manually? I wanted to update Ubuntu manually, because I used CDMA USB modem and connected using wvdial, but it won't able to update Ubuntu via Update Manager, because my Ubuntu won't showing "Connected" message via network-manager.  Can I update Ubuntu manually? Am I should download separate files, or use terminal instead? How do I automatically restart docky after a crash? I have an external HD which used to be my TimeMachine drive. I got a different drive for that, so I want the original drive back as an external on my Windows box, but it has this random 200 MB partition labeled as EFI System Partition. How do I get rid of this? Voldemort was said to be very interested in the four founders of Hogwarts. He created a Horcrux from the Ravenclaw diadem, the Hufflepuff cup, and the Slytherin locket. Did he try to find a Gryffindor relic to complete the set, or did he not bother?   I can't see him giving up on such a task, but maybe there was insufficient time.  Gryffindor's sword was hiding 'inside' the Sorting Hat, but a famous family usually has some other heirlooms too.  If there are no canon answers I'd be interested in your own speculation! How is Selenium RC different from Selenium Web driver and some good pointers for a naive beginner to learn to scripting please? Thanks! When documenting location, should current or historical place names be used? When I am documenting records, do I use the name of a city or country as it is called today or as it was in the year an ancestor was there?  Related to: I can't execute newest Blender 2.80, it says that I need a graphics card that supports OpenGL 3.3 or higher ERROR: A graphics card and driver with support for OpenGL 3.3 or higher is required  Processor: AMD A6-3670 APU with Radeon(tm) HD Graphics, 2695MHz BIOS Version: HPQOEM - 1072009 Dedicated GPU:   This is a very old PC, but when I search online it seems that theoretically Blender 2.8 should run since my openGL is 4.4 Zero to the zero power – is $0^0=1$? Could someone provide me with a good explanation of why $0^0=1$?  My train of thought:  $x&gt;0$  $0^x=0^{x-0}=0^x/0^0$, so  $0^0=0^x/0^x=\,?$  Possible answers:   $0^0\cdot0^x=1\cdot0^0$, so $0^0=1$ $0^0=0^x/0^x=0/0$, which is undefined   PS. I've read the  on mathforum.org, but it isn't clear to me. If I'm not wrong, torque is perpendicular to both the radius and force i. e. It is along the axis of rotation. Questions that arise are- why do we consider the length between the axis/point of rotation while calculating torque? More importantly why is torque a cross product? Disclaimer: I'm pretty novice at sysadmin stuff.  I'm trying to set up port forwarding in an AWS EC2 instance, this has to be done in the command-line because I don't want to go in and edit anything, it has to be automatic (it's part of a build process).   sudo echo "net.ipv4.ip_forward = 1" &gt;&gt; /etc/sysctl.conf      Permission denied   The weird thing is I've been (successfully) using sudo for pretty much every command that required su privileges. If I do sudo su before the command (trying it out by hand in an ssh session), then it works.  Reasons behind this? Possible solutions that don't involve sudo su or manual edits? How can I charge my iPhone without waking up my MacBook Pro? Side-by-side source and output when documenting a style file I get that some spells are "especially swift" to cast and thus have a casting time of "Bonus Action". But is there any reason I couldn't cast such a spell as my Action?   Does it make a difference if the idea is for the one spell to be cast all by itself on a turn or if the desire is to use another Bonus Action (possibly a spell) on the same turn? How can I search for special characters? Should I use "got" or "gotten" in the following sentence? What's the difference about /t̬/ and /d/? What can I do on a Visualforce page that is a renderAs="pdf" that will result in the name of the file that shows up when the user clicks Save As... to not be the name of the Visualforce page.  The page is generated via a GET request coming from clicking a custom button.  Below is some code that is representative of the PDF.   &lt;apex:page standardController="Account" extensions="AccountPdf"           showHeader="false"           sidebar="false"           renderAs="PDF"          title="AccountReport.pdf"          contentType="application/pdf#AccountReport.pdf"          &lt;head&gt;              &lt;title&gt;AccountReport.pdf&lt;/title&gt;          &lt;/head&gt;          &lt;apex:outputText value="Hello World"/&gt;  &lt;/apex:page&gt;   The browser bar does not have the title value in it and when the user clicks Save As... the name of the file is the name of the Visualforce page (e.g., myPageName).  If I remove the renderAs="pdf" the file downloads automatically with the correct file name due to the contentType, but the actual content type doesn't appear to be a PDF. It used to be in settings under the friends tab. The friends tab no longer exists! Where do I find that infuriatingly missing setting now? What is the difference between UNION and UNION ALL?