n | a(n) |
---|---|
1 | -1 |
2 | -1 |
3 | -1 |
4 | -1 |
5 | 3 |
6 | 5 |
7 | 17 |
8 | 13 |
9 | 19 |
10 | 47 |
11 | 79 |
12 | 73 |
13 | 113 |
14 | 109 |
15 | 193 |
16 | 317 |
17 | 313 |
18 | 521 |
19 | 503 |
20 | 523 |
21 | 887 |
22 | 1499 |
23 | 1231 |
24 | 1319 |
25 | 1373 |
26 | 1321 |
27 | 1307 |
28 | 3947 |
29 | 2473 |
30 | 2143 |
31 | 2477 |
32 | 7369 |
33 | 5573 |
34 | 5939 |
35 | 9967 |
36 | 16111 |
37 | 18587 |
38 | 20773 |
39 | 18593 |
40 | 31883 |
41 | 17209 |
42 | 19597 |
43 | 24251 |
44 | 19609 |
45 | 25471 |
46 | 31397 |
47 | 44389 |
48 | 18803 |
49 | 38459 |
50 | 38461 |
51 | 66191 |
52 | 69557 |
53 | 103183 |
[-1,-1,-1,-1,3,5,17,13,19,47,79,73,113,109,193, 317,313,521,503,523,887,1499,1231,1319,1373,1321, 1307,3947,2473,2143,2477,7369,5573,5939,9967, 16111,18587,20773,18593,31883,17209,19597,24251, 19609,25471,31397,44389,18803,38459,38461,66191, 69557,103183] |