A336359 - cp's OEIS frontend

A336359 Numbers k for which bigomega(sigma(k)) < bigomega(k), where bigomega (A001222) gives the number of prime factors with multiplicity, and sigma (A000203) gives the sum of divisors.

n	a(n)
1	4
2	8
3	9
4	16
5	18
6	25
7	32
8	36
9	48
10	50
11	64
12	72
13	80
14	81
15	96
16	100
17	112
18	128
19	144
20	160
21	162
22	176
23	180
24	192
25	196
26	200
27	208
28	225
29	240
30	243
31	256
32	272
33	288
34	289
35	300
36	304
37	320
38	324
39	360
40	384
41	392
42	400
43	405
44	416
45	432
46	441
47	448
48	450
49	464
50	468
51	484
52	486
53	512
54	576
55	578
56	592
57	600
58	624
59	625
60	640
61	648
62	656
63	676
64	688
65	704
66	720
67	729
68	768

[4, 8, 9, 16, 18, 25, 32, 36, 48, 50, 64, 72, 80, 81, 96, 100, 112, 128, 144, 160, 162, 176, 180, 192, 196, 200, 208, 225, 240, 243, 256, 272, 288, 289, 300, 304, 320, 324, 360, 384, 392, 400, 405, 416, 432, 441, 448, 450, 464, 468, 484, 486, 512, 576, 578, 592, 600, 624, 625, 640, 648, 656, 676, 688, 704, 720, 729, 768]

cp's OEIS Frontend

A336359 Numbers k for which bigomega(sigma(k)) < bigomega(k), where bigomega (A001222) gives the number of prime factors with multiplicity, and sigma (A000203) gives the sum of divisors.

Table of values

List of values

n	a(n)
1	4
2	8
3	9
4	16
5	18
6	25
7	32
8	36
9	48
10	50
11	64
12	72
13	80
14	81
15	96
16	100
17	112
18	128
19	144
20	160
21	162
22	176
23	180
24	192
25	196
26	200
27	208
28	225
29	240
30	243
31	256
32	272
33	288
34	289
35	300
36	304
37	320
38	324
39	360
40	384
41	392
42	400
43	405
44	416
45	432
46	441
47	448
48	450
49	464
50	468
51	484
52	486
53	512
54	576
55	578
56	592
57	600
58	624
59	625
60	640
61	648
62	656
63	676
64	688
65	704
66	720
67	729
68	768

n	a(n)
1	4
2	8
3	9
4	16
5	18
6	25
7	32
8	36
9	48
10	50
11	64
12	72
13	80
14	81
15	96
16	100
17	112
18	128
19	144
20	160
21	162
22	176
23	180
24	192
25	196
26	200
27	208
28	225
29	240
30	243
31	256
32	272
33	288
34	289
35	300
36	304
37	320
38	324
39	360
40	384
41	392
42	400
43	405
44	416
45	432
46	441
47	448
48	450
49	464
50	468
51	484
52	486
53	512
54	576
55	578
56	592
57	600
58	624
59	625
60	640
61	648
62	656
63	676
64	688
65	704
66	720
67	729
68	768

n	a(n)
1	4
2	8
3	9
4	16
5	18
6	25
7	32
8	36
9	48
10	50
11	64
12	72
13	80
14	81
15	96
16	100
17	112
18	128
19	144
20	160
21	162
22	176
23	180
24	192
25	196
26	200
27	208
28	225
29	240
30	243
31	256
32	272
33	288
34	289
35	300
36	304
37	320
38	324
39	360
40	384
41	392
42	400
43	405
44	416
45	432
46	441
47	448
48	450
49	464
50	468
51	484
52	486
53	512
54	576
55	578
56	592
57	600
58	624
59	625
60	640
61	648
62	656
63	676
64	688
65	704
66	720
67	729
68	768