A145337 - cp's OEIS frontend

A145337 a(n) = d(p(n)+1) - d(p(n)-1), where d(m) = the number of divisors of m, p(n) = the n-th prime.

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

[1, 1, 1, 0, 2, -2, 1, 0, 4, 2, -2, -5, 0, -2, 6, 2, 8, -8, -2, 4, -8, 2, 8, 4, -6, -1, 0, 8, -4, -2, -4, 4, 0, 4, 6, -4, -8, -4, 12, 2, 14, -10, 6, -10, 3, 0, -10, 4, 8, -4, 4, 12, -14, 10, -1, 12, 10, -6, -8, -8, -2, 6, 0, 8, -12, 2, -10, -14, 8, 0, -4, 20, 2, -4, -4, 12, 10, -14, -7, -8]

cp's OEIS Frontend

A145337 a(n) = d(p(n)+1) - d(p(n)-1), where d(m) = the number of divisors of m, p(n) = the n-th prime.

Table of values

List of values

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

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

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