A126131 - cp's OEIS frontend

A126131 a(n) = number of divisors of n which equal any d(k) for 1 <= k <= n, where d(k) is the number of positive divisors of k.

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

[1, 2, 1, 2, 1, 3, 1, 3, 2, 2, 1, 5, 1, 2, 2, 3, 1, 4, 1, 4, 2, 2, 1, 6, 2, 2, 2, 3, 1, 5, 1, 4, 2, 2, 2, 6, 1, 2, 2, 5, 1, 4, 1, 3, 4, 2, 1, 6, 1, 4, 2, 3, 1, 5, 2, 4, 2, 2, 1, 8, 1, 2, 3, 4, 2, 4, 1, 3, 2, 5, 1, 8, 1, 2, 3, 3, 2, 4, 1, 6, 3, 2, 1, 7, 2, 2, 2, 4, 1, 7, 2, 3, 2, 2, 2, 7, 1, 3, 3, 5, 1, 4, 1, 4, 4]

cp's OEIS Frontend

A126131 a(n) = number of divisors of n which equal any d(k) for 1 <= k <= n, where d(k) is the number of positive divisors of k.

Table of values

List of values

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

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

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