#N Pentoad #O Bill Gosper #C A period 5 oscillator found in June 1977. #C www.conwaylife.com/wiki/index.php?title=Pentoad x = 13, y = 12, rule = B3/S23 11b2o$11bob$9bobob$9b2o2b$5b2o6b$6bo6b$6bo6b$6b2o5b$2b2o9b$bobo9b$bo 11b$2o!