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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 11 |
| 4 | 17 |
| 5 | 71 |
| 6 | 127 |
| 7 | 211 |
| 8 | 227 |
| 9 | 271 |
| 10 | 277 |
| 11 | 727 |
| 12 | 1117 |
| 13 | 1171 |
| 14 | 1217 |
| 15 | 1277 |
| 16 | 1721 |
| 17 | 1777 |
| 18 | 2111 |
| 19 | 2221 |
| 20 | 2711 |
| 21 | 2777 |
| 22 | 7121 |
| 23 | 7127 |
| 24 | 7177 |
| 25 | 7211 |
| 26 | 7717 |
| 27 | 7727 |
| 28 | 11117 |
| 29 | 11171 |
| 30 | 11177 |
| 31 | 11717 |
| 32 | 11777 |
| 33 | 12211 |
| 34 | 12227 |
| 35 | 12277 |
| 36 | 12721 |
| 37 | 17117 |
| 38 | 21121 |
| 39 | 21211 |
| 40 | 21221 |
| 41 | 21227 |
| 42 | 21277 |
| 43 | 21727 |
[2,7,11,17,71,127,211,227,271,277,727,1117,1171, 1217,1277,1721,1777,2111,2221,2711,2777,7121,7127, 7177,7211,7717,7727,11117,11171,11177,11717,11777, 12211,12227,12277,12721,17117,21121,21211,21221, 21227,21277,21727] |