n | a(n) |
---|---|
1 | 2 |
2 | -1 |
3 | -1 |
4 | 1002 |
5 | -1 |
6 | -1 |
7 | 22 |
8 | 3002 |
9 | 32 |
10 | 42 |
11 | 52 |
12 | 302 |
13 | 122 |
14 | 402 |
15 | 132 |
16 | 142 |
17 | 152 |
18 | 322 |
19 | 232 |
20 | 242 |
21 | 252 |
22 | 352 |
23 | 442 |
24 | 452 |
25 | 1352 |
26 | 1442 |
27 | 1452 |
28 | 2352 |
29 | 2442 |
30 | 2452 |
31 | 3452 |
32 | 4442 |
33 | 4452 |
[2,-1,-1,1002,-1,-1,22,3002,32,42,52,302,122,402, 132,142,152,322,232,242,252,352,442,452,1352,1442, 1452,2352,2442,2452,3452,4442,4452] |