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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 137 |
| 3 | 13729 |
| 4 | 13729117 |
| 5 | 137291171639 |
| 6 | 13729117163945893 |
| 7 | 13729117163945893734289 |
| 8 | 1372911716394589373428954337387 |
| 9 | 1372911716394589373428954337387434699097 |
[13,137,13729,13729117,137291171639, 13729117163945893,13729117163945893734289, 1372911716394589373428954337387, 1372911716394589373428954337387434699097] |