A164795 - OEIS

A164795 as a simple table

n	a(n)
1	-1
2	3
3	-1
4	8
5	400
6	300
7	43
8	23
9	48
10	28
11	78
12	103
13	403
14	108
15	408
16	308
17	143
18	123
19	148
20	128
21	178
22	328
23	378
24	1403
25	1108
26	1408
27	1308
28	1143
29	1123
30	1148
31	1128
32	1178
33	1328
34	1378
35	3328
36	3378
37	11378
38	13328
39	13378
40	17378
41	23328
42	23378
43	73378
44	101378
45	103328
46	103378

[-1,3,-1,8,400,300,43,23,48,28,78,103,403,108,408, 308,143,123,148,128,178,328,378,1403,1108,1408, 1308,1143,1123,1148,1128,1178,1328,1378,3328,3378, 11378,13328,13378,17378,23328,23378,73378,101378, 103328,103378]