# A107973 (b-file synthesized from sequence entry) 1 461 2 503 3 547 4 593 5 641 6 691 7 743 8 797 9 853 10 911 11 971 12 1033 13 1097 14 1163 15 1231 16 1301 17 1373 18 1447 19 1523 20 1601