A092405 - cp's OEIS frontend

A092405 a(n) = tau(n) + tau(n+1), where tau(n) = A000005(n), the number of divisors of n.

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

[3, 4, 5, 5, 6, 6, 6, 7, 7, 6, 8, 8, 6, 8, 9, 7, 8, 8, 8, 10, 8, 6, 10, 11, 7, 8, 10, 8, 10, 10, 8, 10, 8, 8, 13, 11, 6, 8, 12, 10, 10, 10, 8, 12, 10, 6, 12, 13, 9, 10, 10, 8, 10, 12, 12, 12, 8, 6, 14, 14, 6, 10, 13, 11, 12, 10, 8, 10, 12, 10, 14, 14, 6, 10, 12, 10, 12, 10, 12, 15, 9, 6, 14, 16]

cp's OEIS Frontend

A092405 a(n) = tau(n) + tau(n+1), where tau(n) = A000005(n), the number of divisors of n.

Table of values

List of values

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

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

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