A210495 - cp's OEIS frontend

A210495 Numbers n such that d(n)*n + 1 is prime, d(n) = number of divisors of n.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	10
7	11
8	12
9	15
10	18
11	22
12	23
13	24
14	27
15	29
16	30
17	32
18	34
19	39
20	41
21	42
22	45
23	52
24	53
25	54
26	56
27	57
28	58
29	63
30	64
31	68
32	69
33	76
34	83
35	84
36	87
37	89
38	93
39	96
40	108
41	110
42	113
43	115
44	131
45	142
46	144
47	147
48	150
49	152
50	153
51	156
52	162
53	165
54	168
55	170
56	172
57	173
58	175
59	177

[1, 2, 3, 4, 5, 10, 11, 12, 15, 18, 22, 23, 24, 27, 29, 30, 32, 34, 39, 41, 42, 45, 52, 53, 54, 56, 57, 58, 63, 64, 68, 69, 76, 83, 84, 87, 89, 93, 96, 108, 110, 113, 115, 131, 142, 144, 147, 150, 152, 153, 156, 162, 165, 168, 170, 172, 173, 175, 177]

cp's OEIS Frontend

A210495 Numbers n such that d(n)*n + 1 is prime, d(n) = number of divisors of n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	10
7	11
8	12
9	15
10	18
11	22
12	23
13	24
14	27
15	29
16	30
17	32
18	34
19	39
20	41
21	42
22	45
23	52
24	53
25	54
26	56
27	57
28	58
29	63
30	64
31	68
32	69
33	76
34	83
35	84
36	87
37	89
38	93
39	96
40	108
41	110
42	113
43	115
44	131
45	142
46	144
47	147
48	150
49	152
50	153
51	156
52	162
53	165
54	168
55	170
56	172
57	173
58	175
59	177

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	10
7	11
8	12
9	15
10	18
11	22
12	23
13	24
14	27
15	29
16	30
17	32
18	34
19	39
20	41
21	42
22	45
23	52
24	53
25	54
26	56
27	57
28	58
29	63
30	64
31	68
32	69
33	76
34	83
35	84
36	87
37	89
38	93
39	96
40	108
41	110
42	113
43	115
44	131
45	142
46	144
47	147
48	150
49	152
50	153
51	156
52	162
53	165
54	168
55	170
56	172
57	173
58	175
59	177

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	10
7	11
8	12
9	15
10	18
11	22
12	23
13	24
14	27
15	29
16	30
17	32
18	34
19	39
20	41
21	42
22	45
23	52
24	53
25	54
26	56
27	57
28	58
29	63
30	64
31	68
32	69
33	76
34	83
35	84
36	87
37	89
38	93
39	96
40	108
41	110
42	113
43	115
44	131
45	142
46	144
47	147
48	150
49	152
50	153
51	156
52	162
53	165
54	168
55	170
56	172
57	173
58	175
59	177