A145339 - cp's OEIS frontend

A145339 a(n) = the minimum 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	1
2	2
3	3
4	4
5	4
6	4
7	5
8	6
9	4
10	6
11	6
12	4
13	8
14	6
15	4
16	6
17	4
18	4
19	6
20	8
21	4
22	8
23	4
24	8
25	6
26	8
27	8
28	4
29	8
30	8
31	8
32	8
33	8
34	8
35	6
36	8
37	4
38	6
39	4
40	6
41	4
42	8
43	8
44	4
45	9
46	12
47	6
48	8
49	4
50	8
51	8
52	8
53	6
54	8
55	8
56	4
57	6
58	10
59	4
60	8
61	6
62	6
63	12
64	8
65	4
66	6
67	6
68	6
69	4
70	12
71	8
72	4
73	8
74	8
75	12
76	4
77	6
78	4
79	8
80	8
81	8
82	4
83	8
84	8
85	8
86	8
87	14
88	4
89	12
90	10
91	4
92	4
93	8
94	12
95	8
96	4
97	6
98	12
99	6
100	4
101	6

[1, 2, 3, 4, 4, 4, 5, 6, 4, 6, 6, 4, 8, 6, 4, 6, 4, 4, 6, 8, 4, 8, 4, 8, 6, 8, 8, 4, 8, 8, 8, 8, 8, 8, 6, 8, 4, 6, 4, 6, 4, 8, 8, 4, 9, 12, 6, 8, 4, 8, 8, 8, 6, 8, 8, 4, 6, 10, 4, 8, 6, 6, 12, 8, 4, 6, 6, 6, 4, 12, 8, 4, 8, 8, 12, 4, 6, 4, 8, 8, 8, 4, 8, 8, 8, 8, 14, 4, 12, 10, 4, 4, 8, 12, 8, 4, 6, 12, 6, 4, 6]

cp's OEIS Frontend

A145339 a(n) = the minimum 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	1
2	2
3	3
4	4
5	4
6	4
7	5
8	6
9	4
10	6
11	6
12	4
13	8
14	6
15	4
16	6
17	4
18	4
19	6
20	8
21	4
22	8
23	4
24	8
25	6
26	8
27	8
28	4
29	8
30	8
31	8
32	8
33	8
34	8
35	6
36	8
37	4
38	6
39	4
40	6
41	4
42	8
43	8
44	4
45	9
46	12
47	6
48	8
49	4
50	8
51	8
52	8
53	6
54	8
55	8
56	4
57	6
58	10
59	4
60	8
61	6
62	6
63	12
64	8
65	4
66	6
67	6
68	6
69	4
70	12
71	8
72	4
73	8
74	8
75	12
76	4
77	6
78	4
79	8
80	8
81	8
82	4
83	8
84	8
85	8
86	8
87	14
88	4
89	12
90	10
91	4
92	4
93	8
94	12
95	8
96	4
97	6
98	12
99	6
100	4
101	6

n	a(n)
1	1
2	2
3	3
4	4
5	4
6	4
7	5
8	6
9	4
10	6
11	6
12	4
13	8
14	6
15	4
16	6
17	4
18	4
19	6
20	8
21	4
22	8
23	4
24	8
25	6
26	8
27	8
28	4
29	8
30	8
31	8
32	8
33	8
34	8
35	6
36	8
37	4
38	6
39	4
40	6
41	4
42	8
43	8
44	4
45	9
46	12
47	6
48	8
49	4
50	8
51	8
52	8
53	6
54	8
55	8
56	4
57	6
58	10
59	4
60	8
61	6
62	6
63	12
64	8
65	4
66	6
67	6
68	6
69	4
70	12
71	8
72	4
73	8
74	8
75	12
76	4
77	6
78	4
79	8
80	8
81	8
82	4
83	8
84	8
85	8
86	8
87	14
88	4
89	12
90	10
91	4
92	4
93	8
94	12
95	8
96	4
97	6
98	12
99	6
100	4
101	6

n	a(n)
1	1
2	2
3	3
4	4
5	4
6	4
7	5
8	6
9	4
10	6
11	6
12	4
13	8
14	6
15	4
16	6
17	4
18	4
19	6
20	8
21	4
22	8
23	4
24	8
25	6
26	8
27	8
28	4
29	8
30	8
31	8
32	8
33	8
34	8
35	6
36	8
37	4
38	6
39	4
40	6
41	4
42	8
43	8
44	4
45	9
46	12
47	6
48	8
49	4
50	8
51	8
52	8
53	6
54	8
55	8
56	4
57	6
58	10
59	4
60	8
61	6
62	6
63	12
64	8
65	4
66	6
67	6
68	6
69	4
70	12
71	8
72	4
73	8
74	8
75	12
76	4
77	6
78	4
79	8
80	8
81	8
82	4
83	8
84	8
85	8
86	8
87	14
88	4
89	12
90	10
91	4
92	4
93	8
94	12
95	8
96	4
97	6
98	12
99	6
100	4
101	6