# A142247 (b-file synthesized from sequence entry) 1 3 2 5 3 7 4 11 5 29 6 31 7 127 8 131 9 8191 10 131071 11 524287 12 536870909 13 2147483647 14 2305843009213693951 15 147573952589676412931 16 618970019642690137449562111 17 162259276829213363391578010288127