# A049091 (b-file synthesized from sequence entry) 1 2 2 3 3 7 4 11 5 23 6 31 7 43 8 47 9 59 10 67 11 71 12 79 13 83 14 103 15 107 16 131 17 139 18 167 19 179 20 191 21 211