A161785 - cp's OEIS frontend

A161785 Numbers k that are in the range of both Euler's phi function and the sigma function.

n	a(n)
1	1
2	4
3	6
4	8
5	12
6	18
7	20
8	24
9	28
10	30
11	32
12	36
13	40
14	42
15	44
16	48
17	54
18	56
19	60
20	72
21	78
22	80
23	84
24	96
25	102
26	104
27	108
28	110
29	112
30	120
31	126
32	128
33	132
34	138
35	140
36	144
37	150
38	156
39	160
40	162
41	164
42	168
43	176
44	180
45	192
46	198
47	200
48	204
49	210
50	212
51	216
52	222
53	224
54	228
55	240
56	252
57	256
58	260

[1, 4, 6, 8, 12, 18, 20, 24, 28, 30, 32, 36, 40, 42, 44, 48, 54, 56, 60, 72, 78, 80, 84, 96, 102, 104, 108, 110, 112, 120, 126, 128, 132, 138, 140, 144, 150, 156, 160, 162, 164, 168, 176, 180, 192, 198, 200, 204, 210, 212, 216, 222, 224, 228, 240, 252, 256, 260]

cp's OEIS Frontend

A161785 Numbers k that are in the range of both Euler's phi function and the sigma function.

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	8
5	12
6	18
7	20
8	24
9	28
10	30
11	32
12	36
13	40
14	42
15	44
16	48
17	54
18	56
19	60
20	72
21	78
22	80
23	84
24	96
25	102
26	104
27	108
28	110
29	112
30	120
31	126
32	128
33	132
34	138
35	140
36	144
37	150
38	156
39	160
40	162
41	164
42	168
43	176
44	180
45	192
46	198
47	200
48	204
49	210
50	212
51	216
52	222
53	224
54	228
55	240
56	252
57	256
58	260

n	a(n)
1	1
2	4
3	6
4	8
5	12
6	18
7	20
8	24
9	28
10	30
11	32
12	36
13	40
14	42
15	44
16	48
17	54
18	56
19	60
20	72
21	78
22	80
23	84
24	96
25	102
26	104
27	108
28	110
29	112
30	120
31	126
32	128
33	132
34	138
35	140
36	144
37	150
38	156
39	160
40	162
41	164
42	168
43	176
44	180
45	192
46	198
47	200
48	204
49	210
50	212
51	216
52	222
53	224
54	228
55	240
56	252
57	256
58	260

n	a(n)
1	1
2	4
3	6
4	8
5	12
6	18
7	20
8	24
9	28
10	30
11	32
12	36
13	40
14	42
15	44
16	48
17	54
18	56
19	60
20	72
21	78
22	80
23	84
24	96
25	102
26	104
27	108
28	110
29	112
30	120
31	126
32	128
33	132
34	138
35	140
36	144
37	150
38	156
39	160
40	162
41	164
42	168
43	176
44	180
45	192
46	198
47	200
48	204
49	210
50	212
51	216
52	222
53	224
54	228
55	240
56	252
57	256
58	260