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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 13 |
| 3 | 911 |
| 4 | 5791 |
| 5 | 79111 |
| 6 | 105107 |
| 7 | 1232527 |
| 8 | 23252729 |
| 9 | 113151719 |
| 10 | 2527293133 |
| 11 | 57911131517 |
| 12 | 991011031051 |
| 13 | 6769717375777 |
| 14 | 13579111315171 |
| 15 | 135791113151719 |
| 16 | 4547495153555759 |
| 17 | 31517192123252729 |
| 18 | 719212325272931333 |
| 19 | 1131517192123252729 |
| 20 | 71921232527293133353 |
[3,13,911,5791,79111,105107,1232527,23252729, 113151719,2527293133,57911131517,991011031051, 6769717375777,13579111315171,135791113151719, 4547495153555759,31517192123252729, 719212325272931333,1131517192123252729, 71921232527293133353] |