Maxima 5.41.0 http://maxima.sourceforge.net using Lisp GNU Common Lisp (GCL) GCL 2.6.12 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) 1+3+5+7+9; (%o1) 25 (%i2) 1+3+5+7+9+9+7+5+3+1; (%o2) 50