#Life 1.05 #D Crystal&decay 2700 #D #D A p150 gun fires at a pair of pentadecathlons. When the first glider #D hits the PDs, it is reflected back and hits the second, forming a #D honey farm. Subsequent gliders form a crystal growing upstream. When #D the crystal reaches an eater near the gun, it begins to decay. #D When it's all gone, the cycle begins again. #D #D The period of this pattern is 2700, but by moving the PDs, any period #D of the form 750 + 1950n (n>=0) can be obtained. #D Dean Hickerson, dean@ucdmath.ucdavis.edu 3/27/90 #N #P -14 -23 ** ** #P -17 -19 ...* ..*** .*...* ...* *.....* *.....* .*...* ..*** #P -19 2 **...** . .*...* ..*** ..*** #P -16 11 ** ** #P -4 -13 ** ** #P 5 -16 ** *.* .*** ..*** .*** *.* ** #P 17 -14 ....* .**** **** *..* **** .**** ....* #P 30 -11 ** ** #P 13 9 ...* .*** * ** #P 1 19 ** * .*** ...* #P 45 47 ..**......** .*..*....*..* ******..****** .*..*....*..* ..**......** #P 40 59 *** *.* *** *** *** *** *.* *** #P -14 -4 ..* *.* .**