# A172508 (b-file synthesized from sequence entry) 1 2 2 3 3 5 4 7 5 13 6 29 7 31 8 41 9 47 10 53 11 61 12 79 13 83 14 97 15 163 16 257 17 461 18 479 19 503 20 613 21 631 22 641 23 683 24 853 25 863 26 947 27 2749 28 4297 29 4729