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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 35 |
| 3 | 3537 |
| 4 | 35373539 |
| 5 | 3537353935373551 |
| 6 | 35373539353735513537353935373569 |
| 7 | 3537353935373551353735393537356935373539353735513537353935373613 |
[3,35,3537,35373539,3537353935373551, 35373539353735513537353935373569, 35373539353735513537353935373569353735393537355135\ 37353935373613] |