# A074931 (b-file synthesized from sequence entry) 1 3 2 5 3 17 4 29 5 41 6 71 7 149 8 281 9 317 10 347 11 359 12 397 13 647 14 751 15 787 16 857 17 907 18 1093 19 1279 20 1381 21 1511 22 1531 23 1663 24 1783 25 2447 26 2683 27 2803 28 3271 29 3323 30 4019 31 4153 32 4513 33 4567 34 4639 35 5557 36 5647 37 5801 38 5923 39 6599 40 6659 41 6911 42 7013 43 7573 44 7883 45 9187 46 9257 47 9431