A379477 - cp's OEIS frontend

A379477 Numbers k such that A003961(k)-2k and A003961(k)-sigma(k) have a common divisor > 1, where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.

n	a(n)
1	6
2	7
3	13
4	18
5	19
6	24
7	28
8	30
9	31
10	37
11	42
12	43
13	46
14	54
15	55
16	60
17	61
18	66
19	67
20	68
21	69
22	72
23	78
24	79
25	90
26	91
27	96
28	97
29	102
30	103
31	106
32	109
33	114
34	120
35	126
36	127
37	131
38	132
39	135
40	138
41	139
42	140
43	146
44	150
45	151
46	162
47	163
48	166
49	168
50	174
51	175
52	180
53	181
54	186
55	193
56	198
57	199
58	200
59	204
60	210
61	216
62	222
63	223
64	229
65	234
66	240
67	241
68	246
69	251

[6, 7, 13, 18, 19, 24, 28, 30, 31, 37, 42, 43, 46, 54, 55, 60, 61, 66, 67, 68, 69, 72, 78, 79, 90, 91, 96, 97, 102, 103, 106, 109, 114, 120, 126, 127, 131, 132, 135, 138, 139, 140, 146, 150, 151, 162, 163, 166, 168, 174, 175, 180, 181, 186, 193, 198, 199, 200, 204, 210, 216, 222, 223, 229, 234, 240, 241, 246, 251]

cp's OEIS Frontend

A379477 Numbers k such that A003961(k)-2k and A003961(k)-sigma(k) have a common divisor > 1, where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.

Table of values

List of values

n	a(n)
1	6
2	7
3	13
4	18
5	19
6	24
7	28
8	30
9	31
10	37
11	42
12	43
13	46
14	54
15	55
16	60
17	61
18	66
19	67
20	68
21	69
22	72
23	78
24	79
25	90
26	91
27	96
28	97
29	102
30	103
31	106
32	109
33	114
34	120
35	126
36	127
37	131
38	132
39	135
40	138
41	139
42	140
43	146
44	150
45	151
46	162
47	163
48	166
49	168
50	174
51	175
52	180
53	181
54	186
55	193
56	198
57	199
58	200
59	204
60	210
61	216
62	222
63	223
64	229
65	234
66	240
67	241
68	246
69	251

n	a(n)
1	6
2	7
3	13
4	18
5	19
6	24
7	28
8	30
9	31
10	37
11	42
12	43
13	46
14	54
15	55
16	60
17	61
18	66
19	67
20	68
21	69
22	72
23	78
24	79
25	90
26	91
27	96
28	97
29	102
30	103
31	106
32	109
33	114
34	120
35	126
36	127
37	131
38	132
39	135
40	138
41	139
42	140
43	146
44	150
45	151
46	162
47	163
48	166
49	168
50	174
51	175
52	180
53	181
54	186
55	193
56	198
57	199
58	200
59	204
60	210
61	216
62	222
63	223
64	229
65	234
66	240
67	241
68	246
69	251

n	a(n)
1	6
2	7
3	13
4	18
5	19
6	24
7	28
8	30
9	31
10	37
11	42
12	43
13	46
14	54
15	55
16	60
17	61
18	66
19	67
20	68
21	69
22	72
23	78
24	79
25	90
26	91
27	96
28	97
29	102
30	103
31	106
32	109
33	114
34	120
35	126
36	127
37	131
38	132
39	135
40	138
41	139
42	140
43	146
44	150
45	151
46	162
47	163
48	166
49	168
50	174
51	175
52	180
53	181
54	186
55	193
56	198
57	199
58	200
59	204
60	210
61	216
62	222
63	223
64	229
65	234
66	240
67	241
68	246
69	251