# A216496 (b-file synthesized from sequence entry) 1 2 2 3 3 5 4 7 5 11 6 13 7 17 8 19 9 31 10 37 11 47 12 61 13 67 14 71 15 73 16 89 17 109 18 137 19 179 20 211 21 277 22 337 23 379 24 499 25 557