A111938 - cp's OEIS frontend

A111938 a(n) = n times number of divisors of n of form 4m+1 - n times number of divisors of form 4m+3.

n	a(n)
1	1
2	2
3	0
4	4
5	10
6	0
7	0
8	8
9	9
10	20
11	0
12	0
13	26
14	0
15	0
16	16
17	34
18	18
19	0
20	40
21	0
22	0
23	0
24	0
25	75
26	52
27	0
28	0
29	58
30	0
31	0
32	32
33	0
34	68
35	0
36	36
37	74
38	0
39	0
40	80
41	82
42	0
43	0
44	0
45	90
46	0
47	0
48	0
49	49
50	150
51	0
52	104
53	106
54	0
55	0
56	0
57	0
58	116
59	0
60	0
61	122
62	0
63	0
64	64
65	260
66	0
67	0
68	136
69	0
70	0
71	0
72	72
73	146
74	148
75	0
76	0
77	0
78	0
79	0
80	160
81	81
82	164

[1, 2, 0, 4, 10, 0, 0, 8, 9, 20, 0, 0, 26, 0, 0, 16, 34, 18, 0, 40, 0, 0, 0, 0, 75, 52, 0, 0, 58, 0, 0, 32, 0, 68, 0, 36, 74, 0, 0, 80, 82, 0, 0, 0, 90, 0, 0, 0, 49, 150, 0, 104, 106, 0, 0, 0, 0, 116, 0, 0, 122, 0, 0, 64, 260, 0, 0, 136, 0, 0, 0, 72, 146, 148, 0, 0, 0, 0, 0, 160, 81, 164]

cp's OEIS Frontend

A111938 a(n) = n times number of divisors of n of form 4m+1 - n times number of divisors of form 4m+3.

Table of values

List of values

n	a(n)
1	1
2	2
3	0
4	4
5	10
6	0
7	0
8	8
9	9
10	20
11	0
12	0
13	26
14	0
15	0
16	16
17	34
18	18
19	0
20	40
21	0
22	0
23	0
24	0
25	75
26	52
27	0
28	0
29	58
30	0
31	0
32	32
33	0
34	68
35	0
36	36
37	74
38	0
39	0
40	80
41	82
42	0
43	0
44	0
45	90
46	0
47	0
48	0
49	49
50	150
51	0
52	104
53	106
54	0
55	0
56	0
57	0
58	116
59	0
60	0
61	122
62	0
63	0
64	64
65	260
66	0
67	0
68	136
69	0
70	0
71	0
72	72
73	146
74	148
75	0
76	0
77	0
78	0
79	0
80	160
81	81
82	164

n	a(n)
1	1
2	2
3	0
4	4
5	10
6	0
7	0
8	8
9	9
10	20
11	0
12	0
13	26
14	0
15	0
16	16
17	34
18	18
19	0
20	40
21	0
22	0
23	0
24	0
25	75
26	52
27	0
28	0
29	58
30	0
31	0
32	32
33	0
34	68
35	0
36	36
37	74
38	0
39	0
40	80
41	82
42	0
43	0
44	0
45	90
46	0
47	0
48	0
49	49
50	150
51	0
52	104
53	106
54	0
55	0
56	0
57	0
58	116
59	0
60	0
61	122
62	0
63	0
64	64
65	260
66	0
67	0
68	136
69	0
70	0
71	0
72	72
73	146
74	148
75	0
76	0
77	0
78	0
79	0
80	160
81	81
82	164

n	a(n)
1	1
2	2
3	0
4	4
5	10
6	0
7	0
8	8
9	9
10	20
11	0
12	0
13	26
14	0
15	0
16	16
17	34
18	18
19	0
20	40
21	0
22	0
23	0
24	0
25	75
26	52
27	0
28	0
29	58
30	0
31	0
32	32
33	0
34	68
35	0
36	36
37	74
38	0
39	0
40	80
41	82
42	0
43	0
44	0
45	90
46	0
47	0
48	0
49	49
50	150
51	0
52	104
53	106
54	0
55	0
56	0
57	0
58	116
59	0
60	0
61	122
62	0
63	0
64	64
65	260
66	0
67	0
68	136
69	0
70	0
71	0
72	72
73	146
74	148
75	0
76	0
77	0
78	0
79	0
80	160
81	81
82	164