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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 13 |
| 3 | 19 |
| 4 | 31 |
| 5 | 37 |
| 6 | 73 |
| 7 | 79 |
| 8 | 97 |
| 9 | 139 |
| 10 | 193 |
| 11 | 199 |
| 12 | 313 |
| 13 | 331 |
| 14 | 337 |
| 15 | 373 |
| 16 | 379 |
| 17 | 397 |
| 18 | 733 |
| 19 | 739 |
| 20 | 919 |
| 21 | 937 |
| 22 | 991 |
| 23 | 997 |
| 24 | 1117 |
| 25 | 1171 |
| 26 | 1399 |
| 27 | 1777 |
| 28 | 1933 |
| 29 | 1993 |
| 30 | 1999 |
| 31 | 3313 |
| 32 | 3319 |
| 33 | 3331 |
| 34 | 3373 |
| 35 | 3391 |
| 36 | 3733 |
| 37 | 3739 |
| 38 | 3793 |
| 39 | 3919 |
| 40 | 3931 |
| 41 | 7177 |
| 42 | 7333 |
| 43 | 7393 |
| 44 | 7717 |
| 45 | 7933 |
| 46 | 7993 |
| 47 | 9133 |
| 48 | 9199 |
| 49 | 9319 |
| 50 | 9337 |
| 51 | 9391 |
| 52 | 9397 |
| 53 | 9733 |
| 54 | 9739 |
| 55 | 9931 |
| 56 | 9973 |
[7,13,19,31,37,73,79,97,139,193,199,313,331,337, 373,379,397,733,739,919,937,991,997,1117,1171, 1399,1777,1933,1993,1999,3313,3319,3331,3373,3391, 3733,3739,3793,3919,3931,7177,7333,7393,7717,7933, 7993,9133,9199,9319,9337,9391,9397,9733,9739,9931, 9973] |