A164793 - OEIS

A164793 as a simple table

n	a(n)
1	-1
2	5
3	13
4	-1
5	1000000
6	4000000
7	45
8	25
9	75
10	13000000
11	17000000
12	105
13	113
14	305
15	313
16	3013
17	145
18	125
19	175
20	325
21	375
22	3075
23	1105
24	1113
25	1305
26	1313
27	3305
28	1145
29	1125
30	1175
31	1325
32	1375
33	3325
34	3375
35	11375
36	13325
37	13375
38	17375
39	23325
40	23375
41	73375
42	101375
43	103325

[-1,5,13,-1,1000000,4000000,45,25,75,13000000, 17000000,105,113,305,313,3013,145,125,175,325,375, 3075,1105,1113,1305,1313,3305,1145,1125,1175,1325, 1375,3325,3375,11375,13325,13375,17375,23325, 23375,73375,101375,103325]