A353684 - cp's OEIS frontend

A353684 Numbers k for which phi(sigma(k)) >= phi(k).

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	14
11	15
12	16
13	18
14	20
15	21
16	22
17	24
18	25
19	26
20	28
21	30
22	32
23	34
24	36
25	39
26	40
27	42
28	44
29	45
30	46
31	48
32	50
33	52
34	54
35	56
36	60
37	62
38	63
39	64
40	66
41	68
42	70
43	72
44	74
45	75
46	76
47	78
48	80
49	81
50	84
51	88
52	90
53	92
54	93
55	94
56	96
57	98
58	100
59	102
60	104
61	105
62	106
63	108
64	110
65	111
66	112
67	114
68	117
69	120
70	122
71	124
72	126
73	128
74	130
75	132
76	136
77	138

[1, 2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 28, 30, 32, 34, 36, 39, 40, 42, 44, 45, 46, 48, 50, 52, 54, 56, 60, 62, 63, 64, 66, 68, 70, 72, 74, 75, 76, 78, 80, 81, 84, 88, 90, 92, 93, 94, 96, 98, 100, 102, 104, 105, 106, 108, 110, 111, 112, 114, 117, 120, 122, 124, 126, 128, 130, 132, 136, 138]

cp's OEIS Frontend

A353684 Numbers k for which phi(sigma(k)) >= phi(k).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	14
11	15
12	16
13	18
14	20
15	21
16	22
17	24
18	25
19	26
20	28
21	30
22	32
23	34
24	36
25	39
26	40
27	42
28	44
29	45
30	46
31	48
32	50
33	52
34	54
35	56
36	60
37	62
38	63
39	64
40	66
41	68
42	70
43	72
44	74
45	75
46	76
47	78
48	80
49	81
50	84
51	88
52	90
53	92
54	93
55	94
56	96
57	98
58	100
59	102
60	104
61	105
62	106
63	108
64	110
65	111
66	112
67	114
68	117
69	120
70	122
71	124
72	126
73	128
74	130
75	132
76	136
77	138

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	14
11	15
12	16
13	18
14	20
15	21
16	22
17	24
18	25
19	26
20	28
21	30
22	32
23	34
24	36
25	39
26	40
27	42
28	44
29	45
30	46
31	48
32	50
33	52
34	54
35	56
36	60
37	62
38	63
39	64
40	66
41	68
42	70
43	72
44	74
45	75
46	76
47	78
48	80
49	81
50	84
51	88
52	90
53	92
54	93
55	94
56	96
57	98
58	100
59	102
60	104
61	105
62	106
63	108
64	110
65	111
66	112
67	114
68	117
69	120
70	122
71	124
72	126
73	128
74	130
75	132
76	136
77	138

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	8
7	9
8	10
9	12
10	14
11	15
12	16
13	18
14	20
15	21
16	22
17	24
18	25
19	26
20	28
21	30
22	32
23	34
24	36
25	39
26	40
27	42
28	44
29	45
30	46
31	48
32	50
33	52
34	54
35	56
36	60
37	62
38	63
39	64
40	66
41	68
42	70
43	72
44	74
45	75
46	76
47	78
48	80
49	81
50	84
51	88
52	90
53	92
54	93
55	94
56	96
57	98
58	100
59	102
60	104
61	105
62	106
63	108
64	110
65	111
66	112
67	114
68	117
69	120
70	122
71	124
72	126
73	128
74	130
75	132
76	136
77	138