A217442 - cp's OEIS frontend

A217442 Numbers n such that d(prime(n) - 1) | n, where d(k) is the number of divisors of k.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	24
7	28
8	30
9	32
10	36
11	45
12	48
13	56
14	64
15	66
16	72
17	76
18	80
19	92
20	96
21	102
22	104
23	120
24	126
25	128
26	144
27	168
28	176
29	180
30	184
31	186
32	192
33	200
34	208
35	228
36	236
37	240
38	248
39	252
40	256
41	270
42	280
43	288
44	292
45	304
46	312
47	320
48	328
49	336
50	352
51	360
52	364
53	376
54	384
55	420
56	424
57	426

[1, 2, 3, 4, 6, 24, 28, 30, 32, 36, 45, 48, 56, 64, 66, 72, 76, 80, 92, 96, 102, 104, 120, 126, 128, 144, 168, 176, 180, 184, 186, 192, 200, 208, 228, 236, 240, 248, 252, 256, 270, 280, 288, 292, 304, 312, 320, 328, 336, 352, 360, 364, 376, 384, 420, 424, 426]

cp's OEIS Frontend

A217442 Numbers n such that d(prime(n) - 1) | n, where d(k) is the number of divisors of k.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	24
7	28
8	30
9	32
10	36
11	45
12	48
13	56
14	64
15	66
16	72
17	76
18	80
19	92
20	96
21	102
22	104
23	120
24	126
25	128
26	144
27	168
28	176
29	180
30	184
31	186
32	192
33	200
34	208
35	228
36	236
37	240
38	248
39	252
40	256
41	270
42	280
43	288
44	292
45	304
46	312
47	320
48	328
49	336
50	352
51	360
52	364
53	376
54	384
55	420
56	424
57	426

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	24
7	28
8	30
9	32
10	36
11	45
12	48
13	56
14	64
15	66
16	72
17	76
18	80
19	92
20	96
21	102
22	104
23	120
24	126
25	128
26	144
27	168
28	176
29	180
30	184
31	186
32	192
33	200
34	208
35	228
36	236
37	240
38	248
39	252
40	256
41	270
42	280
43	288
44	292
45	304
46	312
47	320
48	328
49	336
50	352
51	360
52	364
53	376
54	384
55	420
56	424
57	426

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	24
7	28
8	30
9	32
10	36
11	45
12	48
13	56
14	64
15	66
16	72
17	76
18	80
19	92
20	96
21	102
22	104
23	120
24	126
25	128
26	144
27	168
28	176
29	180
30	184
31	186
32	192
33	200
34	208
35	228
36	236
37	240
38	248
39	252
40	256
41	270
42	280
43	288
44	292
45	304
46	312
47	320
48	328
49	336
50	352
51	360
52	364
53	376
54	384
55	420
56	424
57	426