# Computed using the Mathematica program that I contributed to this sequence 1 2 2 3 3 5 4 7 5 919 6 31513 7 1008001 8 1123211 9 1160611 10 1268621 11 1286821 12 1311131 13 1317131 14 1412141 15 1628261 16 1802081 17 1826281 18 3187813 19 3228223 20 3245423 21 3286823 22 3291923 23 3362633 24 3528253 25 3591953 26 3765673 27 3773773 28 3781873 29 3853583 30 3864683 31 3931393 32 3938393 33 7129217 34 7365637 35 7381837 36 7436347 37 7489847 38 7733377 39 7832387 40 7941497 41 7943497 42 7949497 43 9002009 44 9173719 45 9223229 46 9231329 47 9324239 48 9332339 49 9338339 50 9351539 51 9477749 52 9495949 53 9743479 54 9749479