document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=675295>Question 675295</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the next number in the sequence {1,2,6,15,31,... }? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #419717 by </B><A HREF=/tutors/aboutme.mpl?userid=sachi><B>sachi(548)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sachi><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=sachi><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=419717\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">                 1, 2, 6, 15, 31,   56   92... <BR>\n" );
document.write( "ist difference   1   4  9   16   25  36<BR>\n" );
document.write( "2nd difference     3  5   7    9  11...........<BR>\n" );
document.write( "2=1+1<BR>\n" );
document.write( "6=2+4<BR>\n" );
document.write( "15=6+9<BR>\n" );
document.write( "31=15+16<BR>\n" );
document.write( "56=31+25  <BR>\n" );
document.write( "so onans </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );