A052180 - cp's OEIS frontend

A052180 Last filtering prime for n-th prime p: find smallest prime factor of each of the composite numbers between p and next prime; take maximal value.

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

[2, 2, 3, 2, 3, 2, 3, 5, 2, 5, 3, 2, 3, 7, 5, 2, 5, 3, 2, 7, 3, 5, 7, 3, 2, 3, 2, 3, 11, 3, 7, 2, 11, 2, 5, 7, 3, 13, 5, 2, 11, 2, 3, 2, 11, 13, 3, 2, 3, 5, 2, 13, 11, 7, 5, 2, 5, 3, 2, 17, 13, 3, 2, 3, 17, 5, 11, 2, 3, 5, 19, 7, 13, 3, 5, 17, 3, 13, 7, 2, 7, 2, 19, 3, 5, 11, 3, 2, 3, 11, 13, 3, 17]

cp's OEIS Frontend

A052180 Last filtering prime for n-th prime p: find smallest prime factor of each of the composite numbers between p and next prime; take maximal value.

Table of values

List of values

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

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

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