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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 53 |
| 6 | 73 |
| 7 | 733 |
| 8 | 773 |
| 9 | 5333 |
| 10 | 7333 |
| 11 | 7753 |
| 12 | 55333 |
| 13 | 75533 |
| 14 | 75553 |
| 15 | 77773 |
| 16 | 733333 |
| 17 | 755333 |
| 18 | 775553 |
| 19 | 7553333 |
| 20 | 7555333 |
| 21 | 7775533 |
| 22 | 7777753 |
| 23 | 55555333 |
| 24 | 55555553 |
| 25 | 77755553 |
| 26 | 555553333 |
| 27 | 755555533 |
| 28 | 773333333 |
| 29 | 777555553 |
| 30 | 777773333 |
| 31 | 777775333 |
| 32 | 777775553 |
| 33 | 777777773 |
[2,3,5,7,53,73,733,773,5333,7333,7753,55333,75533, 75553,77773,733333,755333,775553,7553333,7555333, 7775533,7777753,55555333,55555553,77755553, 555553333,755555533,773333333,777555553,777773333, 777775333,777775553,777777773] |