A378981 - cp's OEIS frontend

A378981 a(n) = (A003961(n)-sigma(n)) mod (A003961(n)-2*n), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1).

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	0
8	1
9	5
10	0
11	1
12	17
13	3
14	4
15	1
16	1
17	1
18	36
19	3
20	21
21	10
22	3
23	5
24	75
25	0
26	0
27	14
28	0
29	1
30	33
31	5
32	1
33	0
34	3
35	1
36	134
37	3
38	2
39	1
40	99
41	1
42	69
43	3
44	4
45	12
46	0
47	5
48	281
49	18
50	7
51	2
52	6
53	5
54	255
55	0
56	177
57	0
58	3
59	1
60	147
61	5
62	2
63	22
64	1
65	2
66	51
67	3
68	10
69	0
70	87
71	1
72	480
73	5
74	9
75	26
76	12
77	3
78	87
79	3
80	381
81	41
82	3
83	5
84	271
85	25
86	9
87	16
88	171
89	7
90	291
91	0
92	16
93	0
94	15
95	12

[0, 0, 0, 0, 1, 0, 0, 1, 5, 0, 1, 17, 3, 4, 1, 1, 1, 36, 3, 21, 10, 3, 5, 75, 0, 0, 14, 0, 1, 33, 5, 1, 0, 3, 1, 134, 3, 2, 1, 99, 1, 69, 3, 4, 12, 0, 5, 281, 18, 7, 2, 6, 5, 255, 0, 177, 0, 3, 1, 147, 5, 2, 22, 1, 2, 51, 3, 10, 0, 87, 1, 480, 5, 9, 26, 12, 3, 87, 3, 381, 41, 3, 5, 271, 25, 9, 16, 171, 7, 291, 0, 16, 0, 15, 12]

cp's OEIS Frontend

A378981 a(n) = (A003961(n)-sigma(n)) mod (A003961(n)-2*n), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	0
8	1
9	5
10	0
11	1
12	17
13	3
14	4
15	1
16	1
17	1
18	36
19	3
20	21
21	10
22	3
23	5
24	75
25	0
26	0
27	14
28	0
29	1
30	33
31	5
32	1
33	0
34	3
35	1
36	134
37	3
38	2
39	1
40	99
41	1
42	69
43	3
44	4
45	12
46	0
47	5
48	281
49	18
50	7
51	2
52	6
53	5
54	255
55	0
56	177
57	0
58	3
59	1
60	147
61	5
62	2
63	22
64	1
65	2
66	51
67	3
68	10
69	0
70	87
71	1
72	480
73	5
74	9
75	26
76	12
77	3
78	87
79	3
80	381
81	41
82	3
83	5
84	271
85	25
86	9
87	16
88	171
89	7
90	291
91	0
92	16
93	0
94	15
95	12

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	0
8	1
9	5
10	0
11	1
12	17
13	3
14	4
15	1
16	1
17	1
18	36
19	3
20	21
21	10
22	3
23	5
24	75
25	0
26	0
27	14
28	0
29	1
30	33
31	5
32	1
33	0
34	3
35	1
36	134
37	3
38	2
39	1
40	99
41	1
42	69
43	3
44	4
45	12
46	0
47	5
48	281
49	18
50	7
51	2
52	6
53	5
54	255
55	0
56	177
57	0
58	3
59	1
60	147
61	5
62	2
63	22
64	1
65	2
66	51
67	3
68	10
69	0
70	87
71	1
72	480
73	5
74	9
75	26
76	12
77	3
78	87
79	3
80	381
81	41
82	3
83	5
84	271
85	25
86	9
87	16
88	171
89	7
90	291
91	0
92	16
93	0
94	15
95	12

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	0
8	1
9	5
10	0
11	1
12	17
13	3
14	4
15	1
16	1
17	1
18	36
19	3
20	21
21	10
22	3
23	5
24	75
25	0
26	0
27	14
28	0
29	1
30	33
31	5
32	1
33	0
34	3
35	1
36	134
37	3
38	2
39	1
40	99
41	1
42	69
43	3
44	4
45	12
46	0
47	5
48	281
49	18
50	7
51	2
52	6
53	5
54	255
55	0
56	177
57	0
58	3
59	1
60	147
61	5
62	2
63	22
64	1
65	2
66	51
67	3
68	10
69	0
70	87
71	1
72	480
73	5
74	9
75	26
76	12
77	3
78	87
79	3
80	381
81	41
82	3
83	5
84	271
85	25
86	9
87	16
88	171
89	7
90	291
91	0
92	16
93	0
94	15
95	12