document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=472706>Question 472706</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I write an equation for a simple number sequence - 1,2,3,4,etc. where each time they get added together.  Example would be 1 = 1 total, 2 = 3 total, 3 = 6 total, 4 = 10 total.  I want to be able to get the total of any number.  Example would be 50 = 1,275\r<BR>\n" );
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document.write( "Please help thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #324037 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=324037\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You can either write it as a recursive sequence\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE a_i = a_{i-1} + i\"> where a_1 = 1, \r<BR>\n" );
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document.write( "or recall that the sum of the first n positive integers is n(n+1)/2, in which we get\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE a_i = \frac{i(i+1)}{2}\"> </SPAN>\n" );
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