# Computed using the Mathematica program that I contributed to this sequence 1 2 2 23 3 29 4 41 5 43 6 47 7 61 8 67 9 83 10 89 11 181 12 263 13 269 14 281 15 283 16 461 17 463 18 467 19 487 20 661 21 683 22 863 23 881 24 883 25 887 26 1889 27 2683 28 2687 29 2689 30 2861 31 2887 32 4861 33 4889 34 6689 35 6863 36 6869 37 6883 38 8681 39 8689 40 8861 41 8863 42 8867 43 8887 44 26881 45 28687 46 28867 47 44887 48 46681 49 46687 50 46861 51 46867 52 46889 53 48869 54 48883 55 48889 56 66883 57 66889 58 68683 59 68687 60 68863 61 68881 62 88681 63 88861 64 88867 65 88883 66 268883 67 288683 68 288689 69 448883 70 468683 71 468869 72 468883 73 468887 74 468889 75 488687 76 488689 77 488861 78 648887 79 648889 80 666889 81 668687 82 668867 83 668869 84 684889 85 686687 86 686863 87 688661 88 688669 89 688861 90 688867 91 688889 92 868883 93 888683 94 888689 95 888869 96 888887 97 2688883 98 2688887 99 2888863 100 2888887