A329152 - cp's OEIS frontend

A329152 a(n) = Sum_{i=1..n-1} Sum_{j=1..i-1} [1 == i*j (mod n)], where [] is the Iverson bracket.

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

[0, 0, 0, 0, 1, 0, 2, 0, 2, 1, 4, 0, 5, 2, 2, 2, 7, 2, 8, 2, 4, 4, 10, 0, 9, 5, 8, 4, 13, 2, 14, 6, 8, 7, 10, 4, 17, 8, 10, 4, 19, 4, 20, 8, 10, 10, 22, 4, 20, 9, 14, 10, 25, 8, 18, 8, 16, 13, 28, 4, 29, 14, 16, 14, 22, 8, 32, 14, 20, 10, 34, 8, 35, 17, 18, 16, 28, 10, 38, 12]

cp's OEIS Frontend

A329152 a(n) = Sum_{i=1..n-1} Sum_{j=1..i-1} [1 == i*j (mod n)], where [] is the Iverson bracket.

Table of values

List of values

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

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

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