A379129 - cp's OEIS frontend

A379129 a(n) is the number of unitary proper divisors d > 1 of n for which A048720(A065621(sigma(d)),sigma(n/d)) is equal to sigma(n).

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	1
13	0
14	1
15	1
16	0
17	0
18	0
19	0
20	1
21	2
22	2
23	0
24	1
25	0
26	1
27	0
28	1
29	0
30	5
31	0
32	0
33	1
34	0
35	1
36	0
37	0
38	0
39	1
40	1
41	0
42	3
43	0
44	1
45	0
46	2
47	0
48	1
49	0
50	1
51	1
52	2
53	0
54	0
55	2
56	1
57	1
58	1
59	0
60	3
61	0
62	1
63	1
64	0
65	1
66	5
67	0
68	0
69	1
70	5
71	0
72	1
73	0
74	0
75	1
76	1
77	1
78	3
79	0
80	1
81	0
82	0
83	0
84	3
85	0
86	1
87	1
88	1
89	0
90	0
91	1
92	1
93	2
94	2
95	0
96	1
97	0
98	0
99	0
100	1
101	0
102	1
103	0
104	1
105	3

[0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 2, 2, 0, 1, 0, 1, 0, 1, 0, 5, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 1, 1, 2, 0, 0, 2, 1, 1, 1, 0, 3, 0, 1, 1, 0, 1, 5, 0, 0, 1, 5, 0, 1, 0, 0, 1, 1, 1, 3, 0, 1, 0, 0, 0, 3, 0, 1, 1, 1, 0, 0, 1, 1, 2, 2, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 3]

cp's OEIS Frontend

A379129 a(n) is the number of unitary proper divisors d > 1 of n for which A048720(A065621(sigma(d)),sigma(n/d)) is equal to sigma(n).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	1
13	0
14	1
15	1
16	0
17	0
18	0
19	0
20	1
21	2
22	2
23	0
24	1
25	0
26	1
27	0
28	1
29	0
30	5
31	0
32	0
33	1
34	0
35	1
36	0
37	0
38	0
39	1
40	1
41	0
42	3
43	0
44	1
45	0
46	2
47	0
48	1
49	0
50	1
51	1
52	2
53	0
54	0
55	2
56	1
57	1
58	1
59	0
60	3
61	0
62	1
63	1
64	0
65	1
66	5
67	0
68	0
69	1
70	5
71	0
72	1
73	0
74	0
75	1
76	1
77	1
78	3
79	0
80	1
81	0
82	0
83	0
84	3
85	0
86	1
87	1
88	1
89	0
90	0
91	1
92	1
93	2
94	2
95	0
96	1
97	0
98	0
99	0
100	1
101	0
102	1
103	0
104	1
105	3

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	1
13	0
14	1
15	1
16	0
17	0
18	0
19	0
20	1
21	2
22	2
23	0
24	1
25	0
26	1
27	0
28	1
29	0
30	5
31	0
32	0
33	1
34	0
35	1
36	0
37	0
38	0
39	1
40	1
41	0
42	3
43	0
44	1
45	0
46	2
47	0
48	1
49	0
50	1
51	1
52	2
53	0
54	0
55	2
56	1
57	1
58	1
59	0
60	3
61	0
62	1
63	1
64	0
65	1
66	5
67	0
68	0
69	1
70	5
71	0
72	1
73	0
74	0
75	1
76	1
77	1
78	3
79	0
80	1
81	0
82	0
83	0
84	3
85	0
86	1
87	1
88	1
89	0
90	0
91	1
92	1
93	2
94	2
95	0
96	1
97	0
98	0
99	0
100	1
101	0
102	1
103	0
104	1
105	3

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	1
7	0
8	0
9	0
10	2
11	0
12	1
13	0
14	1
15	1
16	0
17	0
18	0
19	0
20	1
21	2
22	2
23	0
24	1
25	0
26	1
27	0
28	1
29	0
30	5
31	0
32	0
33	1
34	0
35	1
36	0
37	0
38	0
39	1
40	1
41	0
42	3
43	0
44	1
45	0
46	2
47	0
48	1
49	0
50	1
51	1
52	2
53	0
54	0
55	2
56	1
57	1
58	1
59	0
60	3
61	0
62	1
63	1
64	0
65	1
66	5
67	0
68	0
69	1
70	5
71	0
72	1
73	0
74	0
75	1
76	1
77	1
78	3
79	0
80	1
81	0
82	0
83	0
84	3
85	0
86	1
87	1
88	1
89	0
90	0
91	1
92	1
93	2
94	2
95	0
96	1
97	0
98	0
99	0
100	1
101	0
102	1
103	0
104	1
105	3