A325816 - cp's OEIS frontend

A325816 Number of ways to form the sum sigma(n) = x+y, so that n-x and n-y are not coprime, with x and y in range 0..sigma(n).

n	a(n)
1	0
2	0
3	2
4	0
5	3
6	11
7	5
8	0
9	2
10	10
11	7
12	15
13	9
14	13
15	17
16	0
17	9
18	14
19	13
20	22
21	19
22	19
23	13
24	41
25	2
26	27
27	23
28	55
29	17
30	49
31	23
32	0
33	33
34	31
35	27
36	4
37	25
38	31
39	31
40	55
41	25
42	65
43	31
44	43
45	53
46	45
47	25
48	71
49	2
50	14
51	53
52	67
53	29
54	81
55	37
56	61
57	43
58	49
59	31
60	113
61	45
62	55
63	57
64	0
65	43
66	97
67	47
68	77
69	69
70	73
71	47
72	74
73	49
74	61
75	67
76	95
77	49
78	113
79	55
80	101
81	2
82	67
83	43
84	129
85	55
86	81
87	81
88	91
89	49

[0, 0, 2, 0, 3, 11, 5, 0, 2, 10, 7, 15, 9, 13, 17, 0, 9, 14, 13, 22, 19, 19, 13, 41, 2, 27, 23, 55, 17, 49, 23, 0, 33, 31, 27, 4, 25, 31, 31, 55, 25, 65, 31, 43, 53, 45, 25, 71, 2, 14, 53, 67, 29, 81, 37, 61, 43, 49, 31, 113, 45, 55, 57, 0, 43, 97, 47, 77, 69, 73, 47, 74, 49, 61, 67, 95, 49, 113, 55, 101, 2, 67, 43, 129, 55, 81, 81, 91, 49]

cp's OEIS Frontend

A325816 Number of ways to form the sum sigma(n) = x+y, so that n-x and n-y are not coprime, with x and y in range 0..sigma(n).

Table of values

List of values

n	a(n)
1	0
2	0
3	2
4	0
5	3
6	11
7	5
8	0
9	2
10	10
11	7
12	15
13	9
14	13
15	17
16	0
17	9
18	14
19	13
20	22
21	19
22	19
23	13
24	41
25	2
26	27
27	23
28	55
29	17
30	49
31	23
32	0
33	33
34	31
35	27
36	4
37	25
38	31
39	31
40	55
41	25
42	65
43	31
44	43
45	53
46	45
47	25
48	71
49	2
50	14
51	53
52	67
53	29
54	81
55	37
56	61
57	43
58	49
59	31
60	113
61	45
62	55
63	57
64	0
65	43
66	97
67	47
68	77
69	69
70	73
71	47
72	74
73	49
74	61
75	67
76	95
77	49
78	113
79	55
80	101
81	2
82	67
83	43
84	129
85	55
86	81
87	81
88	91
89	49

n	a(n)
1	0
2	0
3	2
4	0
5	3
6	11
7	5
8	0
9	2
10	10
11	7
12	15
13	9
14	13
15	17
16	0
17	9
18	14
19	13
20	22
21	19
22	19
23	13
24	41
25	2
26	27
27	23
28	55
29	17
30	49
31	23
32	0
33	33
34	31
35	27
36	4
37	25
38	31
39	31
40	55
41	25
42	65
43	31
44	43
45	53
46	45
47	25
48	71
49	2
50	14
51	53
52	67
53	29
54	81
55	37
56	61
57	43
58	49
59	31
60	113
61	45
62	55
63	57
64	0
65	43
66	97
67	47
68	77
69	69
70	73
71	47
72	74
73	49
74	61
75	67
76	95
77	49
78	113
79	55
80	101
81	2
82	67
83	43
84	129
85	55
86	81
87	81
88	91
89	49

n	a(n)
1	0
2	0
3	2
4	0
5	3
6	11
7	5
8	0
9	2
10	10
11	7
12	15
13	9
14	13
15	17
16	0
17	9
18	14
19	13
20	22
21	19
22	19
23	13
24	41
25	2
26	27
27	23
28	55
29	17
30	49
31	23
32	0
33	33
34	31
35	27
36	4
37	25
38	31
39	31
40	55
41	25
42	65
43	31
44	43
45	53
46	45
47	25
48	71
49	2
50	14
51	53
52	67
53	29
54	81
55	37
56	61
57	43
58	49
59	31
60	113
61	45
62	55
63	57
64	0
65	43
66	97
67	47
68	77
69	69
70	73
71	47
72	74
73	49
74	61
75	67
76	95
77	49
78	113
79	55
80	101
81	2
82	67
83	43
84	129
85	55
86	81
87	81
88	91
89	49