A138011 - cp's OEIS frontend

A138011 a(n) = number of positive divisors, k, of n where d(k) divides d(n). (d(m) = number of positive divisors of m, A000005).

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

[1, 2, 2, 2, 2, 4, 2, 3, 2, 4, 2, 5, 2, 4, 4, 2, 2, 5, 2, 5, 4, 4, 2, 6, 2, 4, 3, 5, 2, 8, 2, 4, 4, 4, 4, 4, 2, 4, 4, 6, 2, 8, 2, 5, 5, 4, 2, 5, 2, 5, 4, 5, 2, 6, 4, 6, 4, 4, 2, 11, 2, 4, 5, 2, 4, 8, 2, 5, 4, 8, 2, 10, 2, 4, 5, 5, 4, 8, 2, 5, 2, 4, 2, 11, 4, 4, 4, 6, 2, 11, 4, 5, 4, 4, 4, 9, 2, 5, 5, 4]

cp's OEIS Frontend

A138011 a(n) = number of positive divisors, k, of n where d(k) divides d(n). (d(m) = number of positive divisors of m, A000005).

Table of values

List of values

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

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

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