A145340 - cp's OEIS frontend

A145340 a(n) = the maximum of d(p(n)-1) and d(p(n)+1), where d(m) is the number of divisors of m and p(n) is the n-th prime.

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

[2, 3, 4, 4, 6, 6, 6, 6, 8, 8, 8, 9, 8, 8, 10, 8, 12, 12, 8, 12, 12, 10, 12, 12, 12, 9, 8, 12, 12, 10, 12, 12, 8, 12, 12, 12, 12, 10, 16, 8, 18, 18, 14, 14, 12, 12, 16, 12, 12, 12, 12, 20, 20, 18, 9, 16, 16, 16, 12, 16, 8, 12, 12, 16, 16, 8, 16, 20, 12, 12, 12, 24, 10, 12, 16, 16, 16]

cp's OEIS Frontend

A145340 a(n) = the maximum of d(p(n)-1) and d(p(n)+1), where d(m) is the number of divisors of m and p(n) is the n-th prime.

Table of values

List of values

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

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

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