A230201 - cp's OEIS frontend

A230201 Numbers k such that sigma(phi(k)) < k.

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	50
23	54
24	58
25	60
26	64
27	66
28	68
29	70
30	72
31	78
32	80
33	84
34	90
35	92
36	94
37	96
38	98
39	100
40	102
41	106
42	108
43	110
44	114
45	118
46	120
47	126
48	128
49	130
50	132
51	136
52	138
53	140
54	144
55	150
56	156
57	160
58	162
59	166
60	168

[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 30, 32, 34, 36, 40, 42, 44, 46, 48, 50, 54, 58, 60, 64, 66, 68, 70, 72, 78, 80, 84, 90, 92, 94, 96, 98, 100, 102, 106, 108, 110, 114, 118, 120, 126, 128, 130, 132, 136, 138, 140, 144, 150, 156, 160, 162, 166, 168]

cp's OEIS Frontend

A230201 Numbers k such that sigma(phi(k)) < k.

Table of values

List of values

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	50
23	54
24	58
25	60
26	64
27	66
28	68
29	70
30	72
31	78
32	80
33	84
34	90
35	92
36	94
37	96
38	98
39	100
40	102
41	106
42	108
43	110
44	114
45	118
46	120
47	126
48	128
49	130
50	132
51	136
52	138
53	140
54	144
55	150
56	156
57	160
58	162
59	166
60	168

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	50
23	54
24	58
25	60
26	64
27	66
28	68
29	70
30	72
31	78
32	80
33	84
34	90
35	92
36	94
37	96
38	98
39	100
40	102
41	106
42	108
43	110
44	114
45	118
46	120
47	126
48	128
49	130
50	132
51	136
52	138
53	140
54	144
55	150
56	156
57	160
58	162
59	166
60	168

n	a(n)
1	2
2	4
3	6
4	8
5	10
6	12
7	14
8	16
9	18
10	20
11	22
12	24
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	50
23	54
24	58
25	60
26	64
27	66
28	68
29	70
30	72
31	78
32	80
33	84
34	90
35	92
36	94
37	96
38	98
39	100
40	102
41	106
42	108
43	110
44	114
45	118
46	120
47	126
48	128
49	130
50	132
51	136
52	138
53	140
54	144
55	150
56	156
57	160
58	162
59	166
60	168