A328383 - cp's OEIS frontend

A328383 a(n) gives the number of iterations of x -> A003415(x) needed to reach the first number which is either a divisor or multiple of n, but not both at the same time. If no such number can ever be reached, a(n) is 0 (when either n is of the form p^p, or if the iteration would never stop). When the number reached is a divisor of n, a(n) is -1 * iteration count.

n	a(n)
2	-1
3	-1
4	0
5	-1
6	-2
7	-1
8	2
9	-3
10	-2
11	-1
12	9
13	-1
14	-4
15	23
16	1
17	-1
18	-4
19	-1
20	5
21	-2
22	-2
23	-1
24	2
25	-3
26	24
27	0
28	18
29	-1
30	-2
31	-1
32	6
33	-5
34	-2
35	85
36	7
37	-1
38	-4
39	21
40	10
41	-1
42	-2
43	-1
44	35
45	53
46	-4
47	-1
48	2
49	-5
50	44
51	18
52	34
53	-1
54	2
55	21
56	4
57	-3
58	-2
59	-1
60	16
61	-1
62	-6
63	21
64	1
65	-5
66	-2
67	-1
68	7
69	85
70	-2
71	-1
72	4
73	-1
74	23
75	55
76	5
77	-4
78	-2
79	-1
80	4
81	9
82	-2
83	-1
84	42
85	-3
86	42

[-1, -1, 0, -1, -2, -1, 2, -3, -2, -1, 9, -1, -4, 23, 1, -1, -4, -1, 5, -2, -2, -1, 2, -3, 24, 0, 18, -1, -2, -1, 6, -5, -2, 85, 7, -1, -4, 21, 10, -1, -2, -1, 35, 53, -4, -1, 2, -5, 44, 18, 34, -1, 2, 21, 4, -3, -2, -1, 16, -1, -6, 21, 1, -5, -2, -1, 7, 85, -2, -1, 4, -1, 23, 55, 5, -4, -2, -1, 4, 9, -2, -1, 42, -3, 42]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
2	-1
3	-1
4	0
5	-1
6	-2
7	-1
8	2
9	-3
10	-2
11	-1
12	9
13	-1
14	-4
15	23
16	1
17	-1
18	-4
19	-1
20	5
21	-2
22	-2
23	-1
24	2
25	-3
26	24
27	0
28	18
29	-1
30	-2
31	-1
32	6
33	-5
34	-2
35	85
36	7
37	-1
38	-4
39	21
40	10
41	-1
42	-2
43	-1
44	35
45	53
46	-4
47	-1
48	2
49	-5
50	44
51	18
52	34
53	-1
54	2
55	21
56	4
57	-3
58	-2
59	-1
60	16
61	-1
62	-6
63	21
64	1
65	-5
66	-2
67	-1
68	7
69	85
70	-2
71	-1
72	4
73	-1
74	23
75	55
76	5
77	-4
78	-2
79	-1
80	4
81	9
82	-2
83	-1
84	42
85	-3
86	42

n	a(n)
2	-1
3	-1
4	0
5	-1
6	-2
7	-1
8	2
9	-3
10	-2
11	-1
12	9
13	-1
14	-4
15	23
16	1
17	-1
18	-4
19	-1
20	5
21	-2
22	-2
23	-1
24	2
25	-3
26	24
27	0
28	18
29	-1
30	-2
31	-1
32	6
33	-5
34	-2
35	85
36	7
37	-1
38	-4
39	21
40	10
41	-1
42	-2
43	-1
44	35
45	53
46	-4
47	-1
48	2
49	-5
50	44
51	18
52	34
53	-1
54	2
55	21
56	4
57	-3
58	-2
59	-1
60	16
61	-1
62	-6
63	21
64	1
65	-5
66	-2
67	-1
68	7
69	85
70	-2
71	-1
72	4
73	-1
74	23
75	55
76	5
77	-4
78	-2
79	-1
80	4
81	9
82	-2
83	-1
84	42
85	-3
86	42

n	a(n)
2	-1
3	-1
4	0
5	-1
6	-2
7	-1
8	2
9	-3
10	-2
11	-1
12	9
13	-1
14	-4
15	23
16	1
17	-1
18	-4
19	-1
20	5
21	-2
22	-2
23	-1
24	2
25	-3
26	24
27	0
28	18
29	-1
30	-2
31	-1
32	6
33	-5
34	-2
35	85
36	7
37	-1
38	-4
39	21
40	10
41	-1
42	-2
43	-1
44	35
45	53
46	-4
47	-1
48	2
49	-5
50	44
51	18
52	34
53	-1
54	2
55	21
56	4
57	-3
58	-2
59	-1
60	16
61	-1
62	-6
63	21
64	1
65	-5
66	-2
67	-1
68	7
69	85
70	-2
71	-1
72	4
73	-1
74	23
75	55
76	5
77	-4
78	-2
79	-1
80	4
81	9
82	-2
83	-1
84	42
85	-3
86	42