# A027901 (b-file synthesized from sequence entry) 1 1 2 7 3 11 4 13 5 19 6 77 7 91 8 133 9 143 10 209 11 247 12 1001 13 1463 14 1729 15 2717 16 19019 17 52579 18 368053 19 578369 20 683527 21 999001 22 4048583 23 4784689 24 6993007 25 7518797 26 10989011 27 12987013 28 52631579 29 76923077 30 90909091 31 142857143 32 1000000001