# A121877 (b-file synthesized from sequence entry) 1 13 2 19 3 23 4 31 5 47 6 127 7 223 8 281 9 2083 10 5281 11 7411 12 7433 13 19051 14 27239 15 35863 16 70327 17 128941 18 147571 19 182099 20 866029