A349177 - cp's OEIS frontend

A349177 Odd numbers k for which gcd(k, A003961(k)) = gcd(sigma(k), A003961(k)) = 1, where A003961(n) is fully multiplicative with a(prime(k)) = prime(k+1), and sigma is the sum of divisors function.

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	19
10	21
11	23
12	25
13	29
14	31
15	33
16	37
17	39
18	41
19	43
20	47
21	49
22	51
23	53
24	55
25	59
26	61
27	63
28	67
29	69
30	71
31	73
32	79
33	81
34	83
35	85
36	89
37	91
38	93
39	95
40	97
41	101
42	103
43	107
44	109
45	111
46	113
47	115
48	117
49	119
50	121
51	123
52	125
53	127
54	129
55	131
56	133
57	137
58	139
59	141
60	145
61	147
62	149
63	151
64	153
65	155
66	157
67	159
68	161
69	163
70	167
71	169
72	173

[1, 3, 5, 7, 9, 11, 13, 17, 19, 21, 23, 25, 29, 31, 33, 37, 39, 41, 43, 47, 49, 51, 53, 55, 59, 61, 63, 67, 69, 71, 73, 79, 81, 83, 85, 89, 91, 93, 95, 97, 101, 103, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 137, 139, 141, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 167, 169, 173]

cp's OEIS Frontend

A349177 Odd numbers k for which gcd(k, A003961(k)) = gcd(sigma(k), A003961(k)) = 1, where A003961(n) is fully multiplicative with a(prime(k)) = prime(k+1), and sigma is the sum of divisors function.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	19
10	21
11	23
12	25
13	29
14	31
15	33
16	37
17	39
18	41
19	43
20	47
21	49
22	51
23	53
24	55
25	59
26	61
27	63
28	67
29	69
30	71
31	73
32	79
33	81
34	83
35	85
36	89
37	91
38	93
39	95
40	97
41	101
42	103
43	107
44	109
45	111
46	113
47	115
48	117
49	119
50	121
51	123
52	125
53	127
54	129
55	131
56	133
57	137
58	139
59	141
60	145
61	147
62	149
63	151
64	153
65	155
66	157
67	159
68	161
69	163
70	167
71	169
72	173

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	19
10	21
11	23
12	25
13	29
14	31
15	33
16	37
17	39
18	41
19	43
20	47
21	49
22	51
23	53
24	55
25	59
26	61
27	63
28	67
29	69
30	71
31	73
32	79
33	81
34	83
35	85
36	89
37	91
38	93
39	95
40	97
41	101
42	103
43	107
44	109
45	111
46	113
47	115
48	117
49	119
50	121
51	123
52	125
53	127
54	129
55	131
56	133
57	137
58	139
59	141
60	145
61	147
62	149
63	151
64	153
65	155
66	157
67	159
68	161
69	163
70	167
71	169
72	173

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	19
10	21
11	23
12	25
13	29
14	31
15	33
16	37
17	39
18	41
19	43
20	47
21	49
22	51
23	53
24	55
25	59
26	61
27	63
28	67
29	69
30	71
31	73
32	79
33	81
34	83
35	85
36	89
37	91
38	93
39	95
40	97
41	101
42	103
43	107
44	109
45	111
46	113
47	115
48	117
49	119
50	121
51	123
52	125
53	127
54	129
55	131
56	133
57	137
58	139
59	141
60	145
61	147
62	149
63	151
64	153
65	155
66	157
67	159
68	161
69	163
70	167
71	169
72	173