Copyright 2011 Kevin Ryde This file is part of Math-NumSeq. Math-NumSeq is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Math-NumSeq is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Math-NumSeq. If not, see . Version 2, August 2011 - new DigitSum, DigitProduct Version 1, August 2011 - the first version