A217287 - cp's OEIS frontend

A217287 Length of chain of consecutive integers starting with n, where each new integer in the chain has a prime factor which no previous member in the chain has.

n	a(n)
1	3
2	2
3	3
4	4
5	3
6	2
7	5
8	4
9	3
10	5
11	5
12	4
13	3
14	2
15	3
16	8
17	7
18	6
19	5
20	4
21	3
22	5
23	4
24	3
25	5
26	6
27	5
28	4
29	3
30	2
31	5
32	4
33	3
34	6
35	5
36	9
37	8
38	7
39	6
40	5
41	7
42	6
43	5
44	4
45	3
46	8
47	7
48	6
49	5
50	4
51	3
52	8
53	7
54	6
55	5
56	7
57	7
58	6
59	5
60	4
61	3
62	2
63	7
64	8
65	7
66	6
67	5
68	4
69	3
70	5
71	9
72	8
73	7
74	6
75	5
76	5
77	4
78	3
79	11
80	10
81	9
82	8
83	7
84	6
85	5
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	6
95	5
96	9
97	8
98	7
99	9
100	8

[3, 2, 3, 4, 3, 2, 5, 4, 3, 5, 5, 4, 3, 2, 3, 8, 7, 6, 5, 4, 3, 5, 4, 3, 5, 6, 5, 4, 3, 2, 5, 4, 3, 6, 5, 9, 8, 7, 6, 5, 7, 6, 5, 4, 3, 8, 7, 6, 5, 4, 3, 8, 7, 6, 5, 7, 7, 6, 5, 4, 3, 2, 7, 8, 7, 6, 5, 4, 3, 5, 9, 8, 7, 6, 5, 5, 4, 3, 11, 10, 9, 8, 7, 6, 5, 10, 9, 8, 7, 6, 5, 4, 3, 6, 5, 9, 8, 7, 9, 8]

cp's OEIS Frontend

A217287 Length of chain of consecutive integers starting with n, where each new integer in the chain has a prime factor which no previous member in the chain has.

Table of values

List of values

n	a(n)
1	3
2	2
3	3
4	4
5	3
6	2
7	5
8	4
9	3
10	5
11	5
12	4
13	3
14	2
15	3
16	8
17	7
18	6
19	5
20	4
21	3
22	5
23	4
24	3
25	5
26	6
27	5
28	4
29	3
30	2
31	5
32	4
33	3
34	6
35	5
36	9
37	8
38	7
39	6
40	5
41	7
42	6
43	5
44	4
45	3
46	8
47	7
48	6
49	5
50	4
51	3
52	8
53	7
54	6
55	5
56	7
57	7
58	6
59	5
60	4
61	3
62	2
63	7
64	8
65	7
66	6
67	5
68	4
69	3
70	5
71	9
72	8
73	7
74	6
75	5
76	5
77	4
78	3
79	11
80	10
81	9
82	8
83	7
84	6
85	5
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	6
95	5
96	9
97	8
98	7
99	9
100	8

n	a(n)
1	3
2	2
3	3
4	4
5	3
6	2
7	5
8	4
9	3
10	5
11	5
12	4
13	3
14	2
15	3
16	8
17	7
18	6
19	5
20	4
21	3
22	5
23	4
24	3
25	5
26	6
27	5
28	4
29	3
30	2
31	5
32	4
33	3
34	6
35	5
36	9
37	8
38	7
39	6
40	5
41	7
42	6
43	5
44	4
45	3
46	8
47	7
48	6
49	5
50	4
51	3
52	8
53	7
54	6
55	5
56	7
57	7
58	6
59	5
60	4
61	3
62	2
63	7
64	8
65	7
66	6
67	5
68	4
69	3
70	5
71	9
72	8
73	7
74	6
75	5
76	5
77	4
78	3
79	11
80	10
81	9
82	8
83	7
84	6
85	5
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	6
95	5
96	9
97	8
98	7
99	9
100	8

n	a(n)
1	3
2	2
3	3
4	4
5	3
6	2
7	5
8	4
9	3
10	5
11	5
12	4
13	3
14	2
15	3
16	8
17	7
18	6
19	5
20	4
21	3
22	5
23	4
24	3
25	5
26	6
27	5
28	4
29	3
30	2
31	5
32	4
33	3
34	6
35	5
36	9
37	8
38	7
39	6
40	5
41	7
42	6
43	5
44	4
45	3
46	8
47	7
48	6
49	5
50	4
51	3
52	8
53	7
54	6
55	5
56	7
57	7
58	6
59	5
60	4
61	3
62	2
63	7
64	8
65	7
66	6
67	5
68	4
69	3
70	5
71	9
72	8
73	7
74	6
75	5
76	5
77	4
78	3
79	11
80	10
81	9
82	8
83	7
84	6
85	5
86	10
87	9
88	8
89	7
90	6
91	5
92	4
93	3
94	6
95	5
96	9
97	8
98	7
99	9
100	8