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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 31 |
| 5 | 47 |
| 6 | 71 |
| 7 | 73 |
| 8 | 79 |
| 9 | 89 |
| 10 | 103 |
| 11 | 127 |
| 12 | 151 |
| 13 | 167 |
| 14 | 191 |
| 15 | 199 |
| 16 | 223 |
| 17 | 233 |
| 18 | 239 |
| 19 | 263 |
| 20 | 271 |
[2,7,23,31,47,71,73,79,89,103,127,151,167,191,199, 223,233,239,263,271] |