# A063696 (b-file synthesized from sequence entry) 0 0 1 2 2 3 3 7 4 5 5 31 6 5 7 127 8 17 9 73 10 21 11 2047 12 17 13 8191 14 85 15 297 16 257 17 131071 18 65 19 524287 20 273 21 4681 22 1365 23 8388607 24 257 25 1082401 26 5461 27 262657 28 4369 29 536870911 30 387 31 2147483647 32 65537 33 1198665 34 87381 35 17454241 36 4097 37 137438953471 38 349525