A379109 - cp's OEIS frontend

A379109 Dirichlet convolution of A046692 (inverse of sigma) with A336923, where A336923(n) = 1 if sigma(2n) - sigma(n) is a power of 2, otherwise 0.

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

[1, -2, -3, 0, -6, 6, -7, 0, -1, 12, -12, 0, -14, 14, 18, 0, -18, 2, -20, 0, 21, 24, -24, 0, 5, 28, 3, 0, -30, -36, -31, 0, 36, 36, 42, 0, -38, 40, 42, 0, -42, -42, -44, 0, 6, 48, -48, 0, -1, -10, 54, 0, -54, -6, 72, 0, 60, 60, -60, 0, -62, 62, 7, 0, 84, -72, -68, 0, 72, -84, -72, 0, -74, 76, -15, 0, 84, -84, -80, 0, 0, 84]

cp's OEIS Frontend

A379109 Dirichlet convolution of A046692 (inverse of sigma) with A336923, where A336923(n) = 1 if sigma(2n) - sigma(n) is a power of 2, otherwise 0.

Table of values

List of values

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

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

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