A328687 - OEIS

A328687 as a simple table

n	a(n)
1	-1
2	18
3	27
4	-1
5	36
6	38
7	44
8	35
9	-1
10	26
11	16
12	24
13	14
14	35
15	18
16	-1
17	19
18	35
19	24
20	36
21	27
22	12
23	26
24	51
25	-1
26	39
27	16
28	37
29	26
30	25
31	16
32	22
33	23
34	36
35	19
36	-1
37	25
38	25
39	25
40	40
41	57
42	56
43	24
44	11
45	24
46	21
47	23
48	26
49	-1
50	33
51	47
52	22
53	40
54	48
55	22
56	31
57	31
58	22
59	29
60	18
61	16
62	30
63	26
64	-1
65	24

[-1,18,27,-1,36,38,44,35,-1,26,16,24,14,35,18,-1, 19,35,24,36,27,12,26,51,-1,39,16,37,26,25,16,22, 23,36,19,-1,25,25,25,40,57,56,24,11,24,21,23,26, -1,33,47,22,40,48,22,31,31,22,29,18,16,30,26,-1, 24]

n	a(n)
1	-1
2	18
3	27
4	-1
5	36
6	38
7	44
8	35
9	-1
10	26
11	16
12	24
13	14
14	35
15	18
16	-1
17	19
18	35
19	24
20	36
21	27
22	12
23	26
24	51
25	-1
26	39
27	16
28	37
29	26
30	25
31	16
32	22
33	23
34	36
35	19
36	-1
37	25
38	25
39	25
40	40
41	57
42	56
43	24
44	11
45	24
46	21
47	23
48	26
49	-1
50	33
51	47
52	22
53	40
54	48
55	22
56	31
57	31
58	22
59	29
60	18
61	16
62	30
63	26
64	-1
65	24

n	a(n)
1	-1
2	18
3	27
4	-1
5	36
6	38
7	44
8	35
9	-1
10	26
11	16
12	24
13	14
14	35
15	18
16	-1
17	19
18	35
19	24
20	36
21	27
22	12
23	26
24	51
25	-1
26	39
27	16
28	37
29	26
30	25
31	16
32	22
33	23
34	36
35	19
36	-1
37	25
38	25
39	25
40	40
41	57
42	56
43	24
44	11
45	24
46	21
47	23
48	26
49	-1
50	33
51	47
52	22
53	40
54	48
55	22
56	31
57	31
58	22
59	29
60	18
61	16
62	30
63	26
64	-1
65	24

n	a(n)
1	-1
2	18
3	27
4	-1
5	36
6	38
7	44
8	35
9	-1
10	26
11	16
12	24
13	14
14	35
15	18
16	-1
17	19
18	35
19	24
20	36
21	27
22	12
23	26
24	51
25	-1
26	39
27	16
28	37
29	26
30	25
31	16
32	22
33	23
34	36
35	19
36	-1
37	25
38	25
39	25
40	40
41	57
42	56
43	24
44	11
45	24
46	21
47	23
48	26
49	-1
50	33
51	47
52	22
53	40
54	48
55	22
56	31
57	31
58	22
59	29
60	18
61	16
62	30
63	26
64	-1
65	24