A349174 - cp's OEIS frontend

A349174 Odd numbers k for which gcd(k, A003961(k)) is equal to gcd(sigma(k), A003961(k)), 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	135
58	137
59	139
60	141
61	145
62	147
63	149
64	151
65	153
66	155
67	157
68	159
69	161
70	163
71	167
72	169

[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, 135, 137, 139, 141, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 167, 169]

cp's OEIS Frontend

A349174 Odd numbers k for which gcd(k, A003961(k)) is equal to gcd(sigma(k), A003961(k)), 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	135
58	137
59	139
60	141
61	145
62	147
63	149
64	151
65	153
66	155
67	157
68	159
69	161
70	163
71	167
72	169

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	135
58	137
59	139
60	141
61	145
62	147
63	149
64	151
65	153
66	155
67	157
68	159
69	161
70	163
71	167
72	169

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	135
58	137
59	139
60	141
61	145
62	147
63	149
64	151
65	153
66	155
67	157
68	159
69	161
70	163
71	167
72	169