A349166 - cp's OEIS frontend

A349166 Numbers k such that sigma(k) and A003961(k) share a prime factor, where A003961(n) is fully multiplicative function with a(prime(k)) = prime(k+1).

n	a(n)
1	2
2	6
3	8
4	10
5	14
6	18
7	20
8	22
9	24
10	26
11	27
12	30
13	32
14	34
15	38
16	40
17	42
18	44
19	46
20	50
21	54
22	56
23	57
24	58
25	60
26	62
27	65
28	66
29	68
30	70
31	72
32	74
33	78
34	80
35	82
36	86
37	87
38	88
39	90
40	92
41	94
42	96
43	98
44	99
45	100
46	102
47	104
48	106
49	108
50	110
51	114
52	116
53	118
54	120
55	122
56	126
57	128
58	130
59	132
60	134
61	135
62	136
63	138
64	140
65	142
66	146
67	150
68	152
69	154
70	158
71	160
72	162
73	164

[2, 6, 8, 10, 14, 18, 20, 22, 24, 26, 27, 30, 32, 34, 38, 40, 42, 44, 46, 50, 54, 56, 57, 58, 60, 62, 65, 66, 68, 70, 72, 74, 78, 80, 82, 86, 87, 88, 90, 92, 94, 96, 98, 99, 100, 102, 104, 106, 108, 110, 114, 116, 118, 120, 122, 126, 128, 130, 132, 134, 135, 136, 138, 140, 142, 146, 150, 152, 154, 158, 160, 162, 164]

cp's OEIS Frontend

A349166 Numbers k such that sigma(k) and A003961(k) share a prime factor, where A003961(n) is fully multiplicative function with a(prime(k)) = prime(k+1).

Table of values

List of values

n	a(n)
1	2
2	6
3	8
4	10
5	14
6	18
7	20
8	22
9	24
10	26
11	27
12	30
13	32
14	34
15	38
16	40
17	42
18	44
19	46
20	50
21	54
22	56
23	57
24	58
25	60
26	62
27	65
28	66
29	68
30	70
31	72
32	74
33	78
34	80
35	82
36	86
37	87
38	88
39	90
40	92
41	94
42	96
43	98
44	99
45	100
46	102
47	104
48	106
49	108
50	110
51	114
52	116
53	118
54	120
55	122
56	126
57	128
58	130
59	132
60	134
61	135
62	136
63	138
64	140
65	142
66	146
67	150
68	152
69	154
70	158
71	160
72	162
73	164

n	a(n)
1	2
2	6
3	8
4	10
5	14
6	18
7	20
8	22
9	24
10	26
11	27
12	30
13	32
14	34
15	38
16	40
17	42
18	44
19	46
20	50
21	54
22	56
23	57
24	58
25	60
26	62
27	65
28	66
29	68
30	70
31	72
32	74
33	78
34	80
35	82
36	86
37	87
38	88
39	90
40	92
41	94
42	96
43	98
44	99
45	100
46	102
47	104
48	106
49	108
50	110
51	114
52	116
53	118
54	120
55	122
56	126
57	128
58	130
59	132
60	134
61	135
62	136
63	138
64	140
65	142
66	146
67	150
68	152
69	154
70	158
71	160
72	162
73	164

n	a(n)
1	2
2	6
3	8
4	10
5	14
6	18
7	20
8	22
9	24
10	26
11	27
12	30
13	32
14	34
15	38
16	40
17	42
18	44
19	46
20	50
21	54
22	56
23	57
24	58
25	60
26	62
27	65
28	66
29	68
30	70
31	72
32	74
33	78
34	80
35	82
36	86
37	87
38	88
39	90
40	92
41	94
42	96
43	98
44	99
45	100
46	102
47	104
48	106
49	108
50	110
51	114
52	116
53	118
54	120
55	122
56	126
57	128
58	130
59	132
60	134
61	135
62	136
63	138
64	140
65	142
66	146
67	150
68	152
69	154
70	158
71	160
72	162
73	164