A353759 - cp's OEIS frontend

A353759 Numbers k for which A353749(k) <= A353749(sigma(k)), where A353749(k) = phi(k) * A064989(k), and A064989 shifts the prime factorization one step towards lower primes.

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	9
7	10
8	12
9	16
10	18
11	20
12	24
13	25
14	28
15	30
16	32
17	36
18	40
19	44
20	45
21	48
22	49
23	50
24	52
25	54
26	56
27	60
28	64
29	68
30	72
31	74
32	75
33	76
34	80
35	81
36	84
37	88
38	90
39	96
40	98
41	100
42	104
43	108
44	112
45	116
46	117
47	120
48	121
49	126
50	128
51	132
52	136
53	140
54	144
55	148
56	150
57	152
58	156
59	160
60	162
61	164
62	168
63	172
64	176
65	180
66	192
67	196
68	198
69	200
70	204
71	208
72	216
73	220

[1, 2, 4, 6, 8, 9, 10, 12, 16, 18, 20, 24, 25, 28, 30, 32, 36, 40, 44, 45, 48, 49, 50, 52, 54, 56, 60, 64, 68, 72, 74, 75, 76, 80, 81, 84, 88, 90, 96, 98, 100, 104, 108, 112, 116, 117, 120, 121, 126, 128, 132, 136, 140, 144, 148, 150, 152, 156, 160, 162, 164, 168, 172, 176, 180, 192, 196, 198, 200, 204, 208, 216, 220]

cp's OEIS Frontend

A353759 Numbers k for which A353749(k) <= A353749(sigma(k)), where A353749(k) = phi(k) * A064989(k), and A064989 shifts the prime factorization one step towards lower primes.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	9
7	10
8	12
9	16
10	18
11	20
12	24
13	25
14	28
15	30
16	32
17	36
18	40
19	44
20	45
21	48
22	49
23	50
24	52
25	54
26	56
27	60
28	64
29	68
30	72
31	74
32	75
33	76
34	80
35	81
36	84
37	88
38	90
39	96
40	98
41	100
42	104
43	108
44	112
45	116
46	117
47	120
48	121
49	126
50	128
51	132
52	136
53	140
54	144
55	148
56	150
57	152
58	156
59	160
60	162
61	164
62	168
63	172
64	176
65	180
66	192
67	196
68	198
69	200
70	204
71	208
72	216
73	220

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	9
7	10
8	12
9	16
10	18
11	20
12	24
13	25
14	28
15	30
16	32
17	36
18	40
19	44
20	45
21	48
22	49
23	50
24	52
25	54
26	56
27	60
28	64
29	68
30	72
31	74
32	75
33	76
34	80
35	81
36	84
37	88
38	90
39	96
40	98
41	100
42	104
43	108
44	112
45	116
46	117
47	120
48	121
49	126
50	128
51	132
52	136
53	140
54	144
55	148
56	150
57	152
58	156
59	160
60	162
61	164
62	168
63	172
64	176
65	180
66	192
67	196
68	198
69	200
70	204
71	208
72	216
73	220

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	9
7	10
8	12
9	16
10	18
11	20
12	24
13	25
14	28
15	30
16	32
17	36
18	40
19	44
20	45
21	48
22	49
23	50
24	52
25	54
26	56
27	60
28	64
29	68
30	72
31	74
32	75
33	76
34	80
35	81
36	84
37	88
38	90
39	96
40	98
41	100
42	104
43	108
44	112
45	116
46	117
47	120
48	121
49	126
50	128
51	132
52	136
53	140
54	144
55	148
56	150
57	152
58	156
59	160
60	162
61	164
62	168
63	172
64	176
65	180
66	192
67	196
68	198
69	200
70	204
71	208
72	216
73	220