A379239 - cp's OEIS frontend

A379239 Numbers k for which A003961(k)-sigma(k) is prime, where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.

n	a(n)
1	4
2	6
3	7
4	10
5	12
6	13
7	15
8	19
9	21
10	22
11	23
12	28
13	31
14	33
15	34
16	35
17	37
18	39
19	43
20	45
21	47
22	48
23	51
24	53
25	55
26	58
27	61
28	67
29	73
30	76
31	77
32	79
33	82
34	83
35	84
36	89
37	95
38	97
39	103
40	105
41	109
42	111
43	112
44	113
45	115
46	118
47	123
48	124
49	127
50	129
51	131
52	141
53	142
54	143
55	145
56	148
57	151
58	153
59	155
60	156
61	157
62	159
63	161
64	163
65	165
66	167
67	173
68	185
69	187
70	192
71	193
72	199

[4, 6, 7, 10, 12, 13, 15, 19, 21, 22, 23, 28, 31, 33, 34, 35, 37, 39, 43, 45, 47, 48, 51, 53, 55, 58, 61, 67, 73, 76, 77, 79, 82, 83, 84, 89, 95, 97, 103, 105, 109, 111, 112, 113, 115, 118, 123, 124, 127, 129, 131, 141, 142, 143, 145, 148, 151, 153, 155, 156, 157, 159, 161, 163, 165, 167, 173, 185, 187, 192, 193, 199]

cp's OEIS Frontend

A379239 Numbers k for which A003961(k)-sigma(k) is prime, 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	4
2	6
3	7
4	10
5	12
6	13
7	15
8	19
9	21
10	22
11	23
12	28
13	31
14	33
15	34
16	35
17	37
18	39
19	43
20	45
21	47
22	48
23	51
24	53
25	55
26	58
27	61
28	67
29	73
30	76
31	77
32	79
33	82
34	83
35	84
36	89
37	95
38	97
39	103
40	105
41	109
42	111
43	112
44	113
45	115
46	118
47	123
48	124
49	127
50	129
51	131
52	141
53	142
54	143
55	145
56	148
57	151
58	153
59	155
60	156
61	157
62	159
63	161
64	163
65	165
66	167
67	173
68	185
69	187
70	192
71	193
72	199

n	a(n)
1	4
2	6
3	7
4	10
5	12
6	13
7	15
8	19
9	21
10	22
11	23
12	28
13	31
14	33
15	34
16	35
17	37
18	39
19	43
20	45
21	47
22	48
23	51
24	53
25	55
26	58
27	61
28	67
29	73
30	76
31	77
32	79
33	82
34	83
35	84
36	89
37	95
38	97
39	103
40	105
41	109
42	111
43	112
44	113
45	115
46	118
47	123
48	124
49	127
50	129
51	131
52	141
53	142
54	143
55	145
56	148
57	151
58	153
59	155
60	156
61	157
62	159
63	161
64	163
65	165
66	167
67	173
68	185
69	187
70	192
71	193
72	199

n	a(n)
1	4
2	6
3	7
4	10
5	12
6	13
7	15
8	19
9	21
10	22
11	23
12	28
13	31
14	33
15	34
16	35
17	37
18	39
19	43
20	45
21	47
22	48
23	51
24	53
25	55
26	58
27	61
28	67
29	73
30	76
31	77
32	79
33	82
34	83
35	84
36	89
37	95
38	97
39	103
40	105
41	109
42	111
43	112
44	113
45	115
46	118
47	123
48	124
49	127
50	129
51	131
52	141
53	142
54	143
55	145
56	148
57	151
58	153
59	155
60	156
61	157
62	159
63	161
64	163
65	165
66	167
67	173
68	185
69	187
70	192
71	193
72	199