A151999 - cp's OEIS frontend

A151999 Numbers k such that every prime that divides phi(k) also divides k.

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	16
9	18
10	20
11	24
12	30
13	32
14	34
15	36
16	40
17	42
18	48
19	50
20	54
21	60
22	64
23	68
24	72
25	78
26	80
27	84
28	90
29	96
30	100
31	102
32	108
33	110
34	114
35	120
36	126
37	128
38	136
39	144
40	150
41	156
42	160
43	162
44	168
45	170
46	180
47	192
48	200
49	204
50	210
51	216
52	220
53	222
54	228
55	234
56	240
57	250
58	252
59	256
60	270

[1, 2, 4, 6, 8, 10, 12, 16, 18, 20, 24, 30, 32, 34, 36, 40, 42, 48, 50, 54, 60, 64, 68, 72, 78, 80, 84, 90, 96, 100, 102, 108, 110, 114, 120, 126, 128, 136, 144, 150, 156, 160, 162, 168, 170, 180, 192, 200, 204, 210, 216, 220, 222, 228, 234, 240, 250, 252, 256, 270]

cp's OEIS Frontend

A151999 Numbers k such that every prime that divides phi(k) also divides k.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	16
9	18
10	20
11	24
12	30
13	32
14	34
15	36
16	40
17	42
18	48
19	50
20	54
21	60
22	64
23	68
24	72
25	78
26	80
27	84
28	90
29	96
30	100
31	102
32	108
33	110
34	114
35	120
36	126
37	128
38	136
39	144
40	150
41	156
42	160
43	162
44	168
45	170
46	180
47	192
48	200
49	204
50	210
51	216
52	220
53	222
54	228
55	234
56	240
57	250
58	252
59	256
60	270

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	16
9	18
10	20
11	24
12	30
13	32
14	34
15	36
16	40
17	42
18	48
19	50
20	54
21	60
22	64
23	68
24	72
25	78
26	80
27	84
28	90
29	96
30	100
31	102
32	108
33	110
34	114
35	120
36	126
37	128
38	136
39	144
40	150
41	156
42	160
43	162
44	168
45	170
46	180
47	192
48	200
49	204
50	210
51	216
52	220
53	222
54	228
55	234
56	240
57	250
58	252
59	256
60	270

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	12
8	16
9	18
10	20
11	24
12	30
13	32
14	34
15	36
16	40
17	42
18	48
19	50
20	54
21	60
22	64
23	68
24	72
25	78
26	80
27	84
28	90
29	96
30	100
31	102
32	108
33	110
34	114
35	120
36	126
37	128
38	136
39	144
40	150
41	156
42	160
43	162
44	168
45	170
46	180
47	192
48	200
49	204
50	210
51	216
52	220
53	222
54	228
55	234
56	240
57	250
58	252
59	256
60	270