A198724 - cp's OEIS frontend

A198724 Let P(n) be the maximal prime divisor of 3*n+1. Then a(n) is the smallest number of iterations of P(n) such that the a(n)-th iteration < n, and a(n) = 0, if such number does not exist.

n	a(n)
3	2
4	3
5	1
6	6
7	4
8	1
9	1
10	6
11	3
12	2
13	1
14	2
15	2
16	1
17	1
18	1
19	2
20	3
21	1
22	3
23	1
24	2
25	1
26	2
27	6
28	1
29	1
30	1
31	4
32	3
33	1
34	2
35	2
36	3
37	1
38	1
39	5
40	1
41	1
42	3
43	1
44	1
45	1
46	2
47	3
48	1
49	1
50	3
51	1
52	6
53	1
54	2
55	2
56	1
57	1
58	1
59	4
60	2
61	1
62	1
63	1
64	2
65	1
66	2
67	2
68	1
69	1
70	3
71	2
72	1
73	1
74	2
75	2
76	2
77	1
78	1
79	1
80	3
81	1
82	1
83	1
84	1
85	1
86	1
87	3
88	1

[2, 3, 1, 6, 4, 1, 1, 6, 3, 2, 1, 2, 2, 1, 1, 1, 2, 3, 1, 3, 1, 2, 1, 2, 6, 1, 1, 1, 4, 3, 1, 2, 2, 3, 1, 1, 5, 1, 1, 3, 1, 1, 1, 2, 3, 1, 1, 3, 1, 6, 1, 2, 2, 1, 1, 1, 4, 2, 1, 1, 1, 2, 1, 2, 2, 1, 1, 3, 2, 1, 1, 2, 2, 2, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 3, 1]

cp's OEIS Frontend

A198724 Let P(n) be the maximal prime divisor of 3*n+1. Then a(n) is the smallest number of iterations of P(n) such that the a(n)-th iteration < n, and a(n) = 0, if such number does not exist.

Table of values

List of values

n	a(n)
3	2
4	3
5	1
6	6
7	4
8	1
9	1
10	6
11	3
12	2
13	1
14	2
15	2
16	1
17	1
18	1
19	2
20	3
21	1
22	3
23	1
24	2
25	1
26	2
27	6
28	1
29	1
30	1
31	4
32	3
33	1
34	2
35	2
36	3
37	1
38	1
39	5
40	1
41	1
42	3
43	1
44	1
45	1
46	2
47	3
48	1
49	1
50	3
51	1
52	6
53	1
54	2
55	2
56	1
57	1
58	1
59	4
60	2
61	1
62	1
63	1
64	2
65	1
66	2
67	2
68	1
69	1
70	3
71	2
72	1
73	1
74	2
75	2
76	2
77	1
78	1
79	1
80	3
81	1
82	1
83	1
84	1
85	1
86	1
87	3
88	1

n	a(n)
3	2
4	3
5	1
6	6
7	4
8	1
9	1
10	6
11	3
12	2
13	1
14	2
15	2
16	1
17	1
18	1
19	2
20	3
21	1
22	3
23	1
24	2
25	1
26	2
27	6
28	1
29	1
30	1
31	4
32	3
33	1
34	2
35	2
36	3
37	1
38	1
39	5
40	1
41	1
42	3
43	1
44	1
45	1
46	2
47	3
48	1
49	1
50	3
51	1
52	6
53	1
54	2
55	2
56	1
57	1
58	1
59	4
60	2
61	1
62	1
63	1
64	2
65	1
66	2
67	2
68	1
69	1
70	3
71	2
72	1
73	1
74	2
75	2
76	2
77	1
78	1
79	1
80	3
81	1
82	1
83	1
84	1
85	1
86	1
87	3
88	1

n	a(n)
3	2
4	3
5	1
6	6
7	4
8	1
9	1
10	6
11	3
12	2
13	1
14	2
15	2
16	1
17	1
18	1
19	2
20	3
21	1
22	3
23	1
24	2
25	1
26	2
27	6
28	1
29	1
30	1
31	4
32	3
33	1
34	2
35	2
36	3
37	1
38	1
39	5
40	1
41	1
42	3
43	1
44	1
45	1
46	2
47	3
48	1
49	1
50	3
51	1
52	6
53	1
54	2
55	2
56	1
57	1
58	1
59	4
60	2
61	1
62	1
63	1
64	2
65	1
66	2
67	2
68	1
69	1
70	3
71	2
72	1
73	1
74	2
75	2
76	2
77	1
78	1
79	1
80	3
81	1
82	1
83	1
84	1
85	1
86	1
87	3
88	1