A closed-form. I've found something that is very interesting concerning the MRB constant. It is a sequence of closed-forms involving the MRB that gives "0." with interesting accuracy and near perfect symmetry. To see it for yourself, simply plot 1 + Sin[Pi*(5060936308 + 78389363*Floor[n])/m], where m is the MRB Constant, for n from -100 to 100 and then plot it from -10,000 to 10,000. It is simply amazing how close to 0 the range remains! Of course if you plot it from -infinity to infinity you get the typical sinusoid. Marvin Ray Burns, June 22, 2009