Some upper bounds for A096221 and their corresponding rulers Dmitry Kamenetsky, 9/03/2018 a(9)<=22: 1 1 1 1 1 1 1 2 1 1 1 23 19 1 17 3 11 5 7 13 1 1 a(10)<=25: 1 1 7 1 5 1 29 13 19 1 11 3 23 1 1 2 1 1 17 1 1 1 1 1 1 a(11)<=29: 1 1 1 1 13 11 1 1 19 29 3 23 7 5 17 1 31 2 1 1 1 1 1 1 1 1 1 1 1 a(12)<=33: 1 1 1 1 3 1 1 2 1 37 1 1 1 7 17 1 23 1 29 31 1 1 19 1 1 1 11 1 5 1 13 1 1 a(13)<=37: 17 5 1 1 1 1 1 1 1 1 19 13 31 11 23 7 29 37 3 41 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 a(14)<=41: 1 1 1 1 1 1 1 1 1 1 2 17 13 29 11 7 19 37 31 3 5 23 41 43 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 a(15)<=45: 17 3 1 1 1 1 1 1 1 1 1 1 1 23 1 19 37 41 43 13 29 11 31 5 1 2 47 7 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1