The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 53 |
| 3 | 117 |
| 4 | 1713 |
| 5 | 2319 |
| 6 | 3129 |
| 7 | 4137 |
| 8 | 4743 |
| 9 | 5953 |
| 10 | 6761 |
| 11 | 7371 |
| 12 | 8379 |
| 13 | 9789 |
| 14 | 103101 |
| 15 | 109107 |
| 16 | 127113 |
| 17 | 137131 |
| 18 | 149139 |
| 19 | 157151 |
| 20 | 167163 |
| 21 | 179173 |
| 22 | 191181 |
| 23 | 197193 |
| 24 | 211199 |
| 25 | 227223 |
[21,53,117,1713,2319,3129,4137,4743,5953,6761, 7371,8379,9789,103101,109107,127113,137131,149139, 157151,167163,179173,191181,197193,211199,227223] |