A260653 - cp's OEIS frontend

A260653 Phi-practical numbers: integers n such that x^n - 1 has divisors of every degree up to n.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	12
8	15
9	16
10	18
11	20
12	24
13	30
14	32
15	36
16	40
17	42
18	48
19	54
20	56
21	60
22	64
23	72
24	80
25	84
26	90
27	96
28	100
29	105
30	108
31	112
32	120
33	126
34	128
35	132
36	140
37	144
38	150
39	156
40	160
41	162
42	165
43	168
44	176
45	180
46	192
47	195
48	198
49	200
50	208
51	210
52	216
53	220
54	224
55	234

[1, 2, 3, 4, 6, 8, 12, 15, 16, 18, 20, 24, 30, 32, 36, 40, 42, 48, 54, 56, 60, 64, 72, 80, 84, 90, 96, 100, 105, 108, 112, 120, 126, 128, 132, 140, 144, 150, 156, 160, 162, 165, 168, 176, 180, 192, 195, 198, 200, 208, 210, 216, 220, 224, 234]

cp's OEIS Frontend

A260653 Phi-practical numbers: integers n such that x^n - 1 has divisors of every degree up to n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	12
8	15
9	16
10	18
11	20
12	24
13	30
14	32
15	36
16	40
17	42
18	48
19	54
20	56
21	60
22	64
23	72
24	80
25	84
26	90
27	96
28	100
29	105
30	108
31	112
32	120
33	126
34	128
35	132
36	140
37	144
38	150
39	156
40	160
41	162
42	165
43	168
44	176
45	180
46	192
47	195
48	198
49	200
50	208
51	210
52	216
53	220
54	224
55	234

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	12
8	15
9	16
10	18
11	20
12	24
13	30
14	32
15	36
16	40
17	42
18	48
19	54
20	56
21	60
22	64
23	72
24	80
25	84
26	90
27	96
28	100
29	105
30	108
31	112
32	120
33	126
34	128
35	132
36	140
37	144
38	150
39	156
40	160
41	162
42	165
43	168
44	176
45	180
46	192
47	195
48	198
49	200
50	208
51	210
52	216
53	220
54	224
55	234

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	12
8	15
9	16
10	18
11	20
12	24
13	30
14	32
15	36
16	40
17	42
18	48
19	54
20	56
21	60
22	64
23	72
24	80
25	84
26	90
27	96
28	100
29	105
30	108
31	112
32	120
33	126
34	128
35	132
36	140
37	144
38	150
39	156
40	160
41	162
42	165
43	168
44	176
45	180
46	192
47	195
48	198
49	200
50	208
51	210
52	216
53	220
54	224
55	234