A378982 - cp's OEIS frontend

A378982 a(n) = (A003961(n)-(1+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	0
6	2
7	2
8	0
9	4
10	0
11	0
12	16
13	2
14	3
15	0
16	0
17	0
18	35
19	2
20	20
21	9
22	2
23	4
24	74
25	0
26	0
27	13
28	42
29	0
30	32
31	4
32	0
33	0
34	2
35	0
36	133
37	2
38	1
39	0
40	98
41	0
42	68
43	2
44	3
45	11
46	4
47	4
48	280
49	17
50	6
51	1
52	5
53	4
54	254
55	18
56	176
57	0
58	2
59	0
60	146
61	4
62	1
63	21
64	0
65	1
66	50
67	2
68	9
69	6
70	86
71	0
72	479
73	4
74	8
75	25
76	11
77	2
78	86
79	2
80	380
81	40
82	2
83	4
84	270
85	24
86	8
87	15
88	170
89	6
90	290
91	4
92	15

[0, 0, 0, 0, 0, 2, 2, 0, 4, 0, 0, 16, 2, 3, 0, 0, 0, 35, 2, 20, 9, 2, 4, 74, 0, 0, 13, 42, 0, 32, 4, 0, 0, 2, 0, 133, 2, 1, 0, 98, 0, 68, 2, 3, 11, 4, 4, 280, 17, 6, 1, 5, 4, 254, 18, 176, 0, 2, 0, 146, 4, 1, 21, 0, 1, 50, 2, 9, 6, 86, 0, 479, 4, 8, 25, 11, 2, 86, 2, 380, 40, 2, 4, 270, 24, 8, 15, 170, 6, 290, 4, 15]

cp's OEIS Frontend

A378982 a(n) = (A003961(n)-(1+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	0
6	2
7	2
8	0
9	4
10	0
11	0
12	16
13	2
14	3
15	0
16	0
17	0
18	35
19	2
20	20
21	9
22	2
23	4
24	74
25	0
26	0
27	13
28	42
29	0
30	32
31	4
32	0
33	0
34	2
35	0
36	133
37	2
38	1
39	0
40	98
41	0
42	68
43	2
44	3
45	11
46	4
47	4
48	280
49	17
50	6
51	1
52	5
53	4
54	254
55	18
56	176
57	0
58	2
59	0
60	146
61	4
62	1
63	21
64	0
65	1
66	50
67	2
68	9
69	6
70	86
71	0
72	479
73	4
74	8
75	25
76	11
77	2
78	86
79	2
80	380
81	40
82	2
83	4
84	270
85	24
86	8
87	15
88	170
89	6
90	290
91	4
92	15

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	2
8	0
9	4
10	0
11	0
12	16
13	2
14	3
15	0
16	0
17	0
18	35
19	2
20	20
21	9
22	2
23	4
24	74
25	0
26	0
27	13
28	42
29	0
30	32
31	4
32	0
33	0
34	2
35	0
36	133
37	2
38	1
39	0
40	98
41	0
42	68
43	2
44	3
45	11
46	4
47	4
48	280
49	17
50	6
51	1
52	5
53	4
54	254
55	18
56	176
57	0
58	2
59	0
60	146
61	4
62	1
63	21
64	0
65	1
66	50
67	2
68	9
69	6
70	86
71	0
72	479
73	4
74	8
75	25
76	11
77	2
78	86
79	2
80	380
81	40
82	2
83	4
84	270
85	24
86	8
87	15
88	170
89	6
90	290
91	4
92	15

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	2
7	2
8	0
9	4
10	0
11	0
12	16
13	2
14	3
15	0
16	0
17	0
18	35
19	2
20	20
21	9
22	2
23	4
24	74
25	0
26	0
27	13
28	42
29	0
30	32
31	4
32	0
33	0
34	2
35	0
36	133
37	2
38	1
39	0
40	98
41	0
42	68
43	2
44	3
45	11
46	4
47	4
48	280
49	17
50	6
51	1
52	5
53	4
54	254
55	18
56	176
57	0
58	2
59	0
60	146
61	4
62	1
63	21
64	0
65	1
66	50
67	2
68	9
69	6
70	86
71	0
72	479
73	4
74	8
75	25
76	11
77	2
78	86
79	2
80	380
81	40
82	2
83	4
84	270
85	24
86	8
87	15
88	170
89	6
90	290
91	4
92	15