A138010 - cp's OEIS frontend

A138010 a(n) is the number of positive divisors of n that divide d(n), where d(n) is the number of positive divisors of n, A000005(n); a(n) also equals d(gcd(n, d(n))).

n	a(n)
1	1
2	2
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	4
13	1
14	2
15	1
16	1
17	1
18	4
19	1
20	2
21	1
22	2
23	1
24	4
25	1
26	2
27	1
28	2
29	1
30	2
31	1
32	2
33	1
34	2
35	1
36	3
37	1
38	2
39	1
40	4
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	2
49	1
50	2
51	1
52	2
53	1
54	2
55	1
56	4
57	1
58	2
59	1
60	6
61	1
62	2
63	2
64	1
65	1
66	2
67	1
68	2
69	1
70	2
71	1
72	6
73	1
74	2
75	2
76	2
77	1
78	2
79	1
80	4
81	1
82	2
83	1
84	6
85	1
86	2
87	1
88	4
89	1
90	4
91	1
92	2
93	1
94	2
95	1
96	6
97	1
98	2
99	2
100	1
101	1
102	2
103	1
104	4
105	1
106	2
107	1
108	6
109	1
110	2
111	1
112	2
113	1
114	2
115	1
116	2
117	2
118	2
119	1
120	4

[1, 2, 1, 1, 1, 2, 1, 3, 2, 2, 1, 4, 1, 2, 1, 1, 1, 4, 1, 2, 1, 2, 1, 4, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 4, 1, 2, 1, 6, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 1, 6, 1, 2, 2, 2, 1, 2, 1, 4, 1, 2, 1, 6, 1, 2, 1, 4, 1, 4, 1, 2, 1, 2, 1, 6, 1, 2, 2, 1, 1, 2, 1, 4, 1, 2, 1, 6, 1, 2, 1, 2, 1, 2, 1, 2, 2, 2, 1, 4]

cp's OEIS Frontend

A138010 a(n) is the number of positive divisors of n that divide d(n), where d(n) is the number of positive divisors of n, A000005(n); a(n) also equals d(gcd(n, d(n))).

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	4
13	1
14	2
15	1
16	1
17	1
18	4
19	1
20	2
21	1
22	2
23	1
24	4
25	1
26	2
27	1
28	2
29	1
30	2
31	1
32	2
33	1
34	2
35	1
36	3
37	1
38	2
39	1
40	4
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	2
49	1
50	2
51	1
52	2
53	1
54	2
55	1
56	4
57	1
58	2
59	1
60	6
61	1
62	2
63	2
64	1
65	1
66	2
67	1
68	2
69	1
70	2
71	1
72	6
73	1
74	2
75	2
76	2
77	1
78	2
79	1
80	4
81	1
82	2
83	1
84	6
85	1
86	2
87	1
88	4
89	1
90	4
91	1
92	2
93	1
94	2
95	1
96	6
97	1
98	2
99	2
100	1
101	1
102	2
103	1
104	4
105	1
106	2
107	1
108	6
109	1
110	2
111	1
112	2
113	1
114	2
115	1
116	2
117	2
118	2
119	1
120	4

n	a(n)
1	1
2	2
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	4
13	1
14	2
15	1
16	1
17	1
18	4
19	1
20	2
21	1
22	2
23	1
24	4
25	1
26	2
27	1
28	2
29	1
30	2
31	1
32	2
33	1
34	2
35	1
36	3
37	1
38	2
39	1
40	4
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	2
49	1
50	2
51	1
52	2
53	1
54	2
55	1
56	4
57	1
58	2
59	1
60	6
61	1
62	2
63	2
64	1
65	1
66	2
67	1
68	2
69	1
70	2
71	1
72	6
73	1
74	2
75	2
76	2
77	1
78	2
79	1
80	4
81	1
82	2
83	1
84	6
85	1
86	2
87	1
88	4
89	1
90	4
91	1
92	2
93	1
94	2
95	1
96	6
97	1
98	2
99	2
100	1
101	1
102	2
103	1
104	4
105	1
106	2
107	1
108	6
109	1
110	2
111	1
112	2
113	1
114	2
115	1
116	2
117	2
118	2
119	1
120	4

n	a(n)
1	1
2	2
3	1
4	1
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	4
13	1
14	2
15	1
16	1
17	1
18	4
19	1
20	2
21	1
22	2
23	1
24	4
25	1
26	2
27	1
28	2
29	1
30	2
31	1
32	2
33	1
34	2
35	1
36	3
37	1
38	2
39	1
40	4
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	2
49	1
50	2
51	1
52	2
53	1
54	2
55	1
56	4
57	1
58	2
59	1
60	6
61	1
62	2
63	2
64	1
65	1
66	2
67	1
68	2
69	1
70	2
71	1
72	6
73	1
74	2
75	2
76	2
77	1
78	2
79	1
80	4
81	1
82	2
83	1
84	6
85	1
86	2
87	1
88	4
89	1
90	4
91	1
92	2
93	1
94	2
95	1
96	6
97	1
98	2
99	2
100	1
101	1
102	2
103	1
104	4
105	1
106	2
107	1
108	6
109	1
110	2
111	1
112	2
113	1
114	2
115	1
116	2
117	2
118	2
119	1
120	4