A349165 - cp's OEIS frontend

A349165 Numbers k such that sigma(k) and A003961(k) are relatively prime, where A003961(n) is fully multiplicative function with a(prime(k)) = prime(k+1).

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	9
7	11
8	12
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	28
18	29
19	31
20	33
21	35
22	36
23	37
24	39
25	41
26	43
27	45
28	47
29	48
30	49
31	51
32	52
33	53
34	55
35	59
36	61
37	63
38	64
39	67
40	69
41	71
42	73
43	75
44	76
45	77
46	79
47	81
48	83
49	84
50	85
51	89
52	91
53	93
54	95
55	97
56	101
57	103
58	105
59	107
60	109
61	111
62	112
63	113
64	115
65	117
66	119
67	121
68	123
69	124
70	125
71	127
72	129
73	131
74	133
75	137
76	139

[1, 3, 4, 5, 7, 9, 11, 12, 13, 15, 16, 17, 19, 21, 23, 25, 28, 29, 31, 33, 35, 36, 37, 39, 41, 43, 45, 47, 48, 49, 51, 52, 53, 55, 59, 61, 63, 64, 67, 69, 71, 73, 75, 76, 77, 79, 81, 83, 84, 85, 89, 91, 93, 95, 97, 101, 103, 105, 107, 109, 111, 112, 113, 115, 117, 119, 121, 123, 124, 125, 127, 129, 131, 133, 137, 139]

cp's OEIS Frontend

A349165 Numbers k such that sigma(k) and A003961(k) are relatively prime, where A003961(n) is fully multiplicative function with a(prime(k)) = prime(k+1).

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	9
7	11
8	12
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	28
18	29
19	31
20	33
21	35
22	36
23	37
24	39
25	41
26	43
27	45
28	47
29	48
30	49
31	51
32	52
33	53
34	55
35	59
36	61
37	63
38	64
39	67
40	69
41	71
42	73
43	75
44	76
45	77
46	79
47	81
48	83
49	84
50	85
51	89
52	91
53	93
54	95
55	97
56	101
57	103
58	105
59	107
60	109
61	111
62	112
63	113
64	115
65	117
66	119
67	121
68	123
69	124
70	125
71	127
72	129
73	131
74	133
75	137
76	139

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	9
7	11
8	12
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	28
18	29
19	31
20	33
21	35
22	36
23	37
24	39
25	41
26	43
27	45
28	47
29	48
30	49
31	51
32	52
33	53
34	55
35	59
36	61
37	63
38	64
39	67
40	69
41	71
42	73
43	75
44	76
45	77
46	79
47	81
48	83
49	84
50	85
51	89
52	91
53	93
54	95
55	97
56	101
57	103
58	105
59	107
60	109
61	111
62	112
63	113
64	115
65	117
66	119
67	121
68	123
69	124
70	125
71	127
72	129
73	131
74	133
75	137
76	139

n	a(n)
1	1
2	3
3	4
4	5
5	7
6	9
7	11
8	12
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	28
18	29
19	31
20	33
21	35
22	36
23	37
24	39
25	41
26	43
27	45
28	47
29	48
30	49
31	51
32	52
33	53
34	55
35	59
36	61
37	63
38	64
39	67
40	69
41	71
42	73
43	75
44	76
45	77
46	79
47	81
48	83
49	84
50	85
51	89
52	91
53	93
54	95
55	97
56	101
57	103
58	105
59	107
60	109
61	111
62	112
63	113
64	115
65	117
66	119
67	121
68	123
69	124
70	125
71	127
72	129
73	131
74	133
75	137
76	139