A230626 - cp's OEIS frontend

A230626 Iterate the map x -> A230625(x) starting at n; sequence gives number of steps to reach a prime, or -1 if no prime is ever reached.

n	a(n)
2	0
3	0
4	3
5	0
6	1
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	1
15	1
16	4
17	0
18	4
19	0
20	3
21	1
22	1
23	0
24	1
25	2
26	4
27	2
28	3
29	0
30	2
31	0
32	2
33	1
34	5
35	1
36	7
37	0
38	1
39	1
40	2
41	0
42	2
43	0
44	2
45	3
46	3
47	0
48	1
49	3
50	3
51	1
52	1
53	0
54	1
55	3
56	2
57	6
58	2
59	0
60	1
61	0
62	2
63	2
64	2
65	2
66	3
67	0
68	1
69	2
70	6
71	0
72	2
73	0
74	4
75	4
76	3
77	2
78	2
79	0
80	4
81	4
82	3
83	0
84	5
85	2
86	2
87	2
88	3

[0, 0, 3, 0, 1, 0, 1, 2, 2, 0, 1, 0, 1, 1, 4, 0, 4, 0, 3, 1, 1, 0, 1, 2, 4, 2, 3, 0, 2, 0, 2, 1, 5, 1, 7, 0, 1, 1, 2, 0, 2, 0, 2, 3, 3, 0, 1, 3, 3, 1, 1, 0, 1, 3, 2, 6, 2, 0, 1, 0, 2, 2, 2, 2, 3, 0, 1, 2, 6, 0, 2, 0, 4, 4, 3, 2, 2, 0, 4, 4, 3, 0, 5, 2, 2, 2, 3]

cp's OEIS Frontend

A230626 Iterate the map x -> A230625(x) starting at n; sequence gives number of steps to reach a prime, or -1 if no prime is ever reached.

Table of values

List of values

n	a(n)
2	0
3	0
4	3
5	0
6	1
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	1
15	1
16	4
17	0
18	4
19	0
20	3
21	1
22	1
23	0
24	1
25	2
26	4
27	2
28	3
29	0
30	2
31	0
32	2
33	1
34	5
35	1
36	7
37	0
38	1
39	1
40	2
41	0
42	2
43	0
44	2
45	3
46	3
47	0
48	1
49	3
50	3
51	1
52	1
53	0
54	1
55	3
56	2
57	6
58	2
59	0
60	1
61	0
62	2
63	2
64	2
65	2
66	3
67	0
68	1
69	2
70	6
71	0
72	2
73	0
74	4
75	4
76	3
77	2
78	2
79	0
80	4
81	4
82	3
83	0
84	5
85	2
86	2
87	2
88	3

n	a(n)
2	0
3	0
4	3
5	0
6	1
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	1
15	1
16	4
17	0
18	4
19	0
20	3
21	1
22	1
23	0
24	1
25	2
26	4
27	2
28	3
29	0
30	2
31	0
32	2
33	1
34	5
35	1
36	7
37	0
38	1
39	1
40	2
41	0
42	2
43	0
44	2
45	3
46	3
47	0
48	1
49	3
50	3
51	1
52	1
53	0
54	1
55	3
56	2
57	6
58	2
59	0
60	1
61	0
62	2
63	2
64	2
65	2
66	3
67	0
68	1
69	2
70	6
71	0
72	2
73	0
74	4
75	4
76	3
77	2
78	2
79	0
80	4
81	4
82	3
83	0
84	5
85	2
86	2
87	2
88	3

n	a(n)
2	0
3	0
4	3
5	0
6	1
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	1
15	1
16	4
17	0
18	4
19	0
20	3
21	1
22	1
23	0
24	1
25	2
26	4
27	2
28	3
29	0
30	2
31	0
32	2
33	1
34	5
35	1
36	7
37	0
38	1
39	1
40	2
41	0
42	2
43	0
44	2
45	3
46	3
47	0
48	1
49	3
50	3
51	1
52	1
53	0
54	1
55	3
56	2
57	6
58	2
59	0
60	1
61	0
62	2
63	2
64	2
65	2
66	3
67	0
68	1
69	2
70	6
71	0
72	2
73	0
74	4
75	4
76	3
77	2
78	2
79	0
80	4
81	4
82	3
83	0
84	5
85	2
86	2
87	2
88	3