A336562 - cp's OEIS frontend

A336562 Number of pairs sigma(p^x), sigma(q^y) that are not coprime, where p^x and q^y are any two maximal prime power divisors of n, with p < q. a(1) = 0.

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

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

cp's OEIS Frontend

A336562 Number of pairs sigma(p^x), sigma(q^y) that are not coprime, where p^x and q^y are any two maximal prime power divisors of n, with p < q. a(1) = 0.

Table of values

List of values

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

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

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