A057690 - cp's OEIS frontend

A057690 Length of cycle in trajectory of P under the 'Px+1' map, where P = n-th prime, or -1 if trajectory does not cycle.

n	a(n)
2	3
3	3
4	4
5	4
6	3
7	4
8	4
9	5
10	4
11	6
12	3
13	4
14	4
15	6
16	5
17	5
18	3
19	4
20	6
21	3
22	6
23	5
24	5
25	4
26	4
27	5
28	6
29	4
30	4
31	8
32	5
33	4
34	5
35	5
36	5
37	3
38	4
39	6
40	4
41	6
42	4
43	8
44	3
45	5
46	6
47	4
48	7
49	5
50	4
51	5
52	7
53	4
54	6
55	4
56	6
57	6
58	6
59	3
60	12
61	4
62	5
63	5
64	6
65	3
66	4
67	4
68	4
69	5
70	5
71	4
72	7
73	6
74	4
75	5
76	9
77	5
78	3
79	4
80	4
81	6
82	3
83	8
84	4
85	6
86	5
87	6
88	3
89	5
90	6
91	6
92	8
93	5
94	5
95	6
96	7
97	5
98	5
99	4
100	3
101	4
102	5
103	5
104	5
105	5
106	4

[3, 3, 4, 4, 3, 4, 4, 5, 4, 6, 3, 4, 4, 6, 5, 5, 3, 4, 6, 3, 6, 5, 5, 4, 4, 5, 6, 4, 4, 8, 5, 4, 5, 5, 5, 3, 4, 6, 4, 6, 4, 8, 3, 5, 6, 4, 7, 5, 4, 5, 7, 4, 6, 4, 6, 6, 6, 3, 12, 4, 5, 5, 6, 3, 4, 4, 4, 5, 5, 4, 7, 6, 4, 5, 9, 5, 3, 4, 4, 6, 3, 8, 4, 6, 5, 6, 3, 5, 6, 6, 8, 5, 5, 6, 7, 5, 5, 4, 3, 4, 5, 5, 5, 5, 4]

cp's OEIS Frontend

A057690 Length of cycle in trajectory of P under the 'Px+1' map, where P = n-th prime, or -1 if trajectory does not cycle.

Table of values

List of values

n	a(n)
2	3
3	3
4	4
5	4
6	3
7	4
8	4
9	5
10	4
11	6
12	3
13	4
14	4
15	6
16	5
17	5
18	3
19	4
20	6
21	3
22	6
23	5
24	5
25	4
26	4
27	5
28	6
29	4
30	4
31	8
32	5
33	4
34	5
35	5
36	5
37	3
38	4
39	6
40	4
41	6
42	4
43	8
44	3
45	5
46	6
47	4
48	7
49	5
50	4
51	5
52	7
53	4
54	6
55	4
56	6
57	6
58	6
59	3
60	12
61	4
62	5
63	5
64	6
65	3
66	4
67	4
68	4
69	5
70	5
71	4
72	7
73	6
74	4
75	5
76	9
77	5
78	3
79	4
80	4
81	6
82	3
83	8
84	4
85	6
86	5
87	6
88	3
89	5
90	6
91	6
92	8
93	5
94	5
95	6
96	7
97	5
98	5
99	4
100	3
101	4
102	5
103	5
104	5
105	5
106	4

n	a(n)
2	3
3	3
4	4
5	4
6	3
7	4
8	4
9	5
10	4
11	6
12	3
13	4
14	4
15	6
16	5
17	5
18	3
19	4
20	6
21	3
22	6
23	5
24	5
25	4
26	4
27	5
28	6
29	4
30	4
31	8
32	5
33	4
34	5
35	5
36	5
37	3
38	4
39	6
40	4
41	6
42	4
43	8
44	3
45	5
46	6
47	4
48	7
49	5
50	4
51	5
52	7
53	4
54	6
55	4
56	6
57	6
58	6
59	3
60	12
61	4
62	5
63	5
64	6
65	3
66	4
67	4
68	4
69	5
70	5
71	4
72	7
73	6
74	4
75	5
76	9
77	5
78	3
79	4
80	4
81	6
82	3
83	8
84	4
85	6
86	5
87	6
88	3
89	5
90	6
91	6
92	8
93	5
94	5
95	6
96	7
97	5
98	5
99	4
100	3
101	4
102	5
103	5
104	5
105	5
106	4

n	a(n)
2	3
3	3
4	4
5	4
6	3
7	4
8	4
9	5
10	4
11	6
12	3
13	4
14	4
15	6
16	5
17	5
18	3
19	4
20	6
21	3
22	6
23	5
24	5
25	4
26	4
27	5
28	6
29	4
30	4
31	8
32	5
33	4
34	5
35	5
36	5
37	3
38	4
39	6
40	4
41	6
42	4
43	8
44	3
45	5
46	6
47	4
48	7
49	5
50	4
51	5
52	7
53	4
54	6
55	4
56	6
57	6
58	6
59	3
60	12
61	4
62	5
63	5
64	6
65	3
66	4
67	4
68	4
69	5
70	5
71	4
72	7
73	6
74	4
75	5
76	9
77	5
78	3
79	4
80	4
81	6
82	3
83	8
84	4
85	6
86	5
87	6
88	3
89	5
90	6
91	6
92	8
93	5
94	5
95	6
96	7
97	5
98	5
99	4
100	3
101	4
102	5
103	5
104	5
105	5
106	4