A347247 - cp's OEIS frontend

A347247 Numbers k such that the greatest prime factor of A000593(k) [the sum of their odd divisors] is at least as large as the greatest prime factor of k itself.

n	a(n)
1	1
2	9
3	18
4	25
5	27
6	36
7	45
8	49
9	50
10	54
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	117
21	121
22	125
23	126
24	135
25	144
26	147
27	150
28	162
29	169
30	175
31	180
32	196
33	198
34	200
35	216
36	225
37	234
38	242
39	243
40	245
41	250
42	252
43	270
44	275
45	288
46	289
47	294
48	300
49	315
50	324
51	325
52	338
53	350
54	360
55	361
56	363
57	375
58	392
59	396
60	400
61	405
62	425
63	432
64	441
65	450
66	468
67	475

[1, 9, 18, 25, 27, 36, 45, 49, 50, 54, 63, 72, 75, 81, 90, 98, 99, 100, 108, 117, 121, 125, 126, 135, 144, 147, 150, 162, 169, 175, 180, 196, 198, 200, 216, 225, 234, 242, 243, 245, 250, 252, 270, 275, 288, 289, 294, 300, 315, 324, 325, 338, 350, 360, 361, 363, 375, 392, 396, 400, 405, 425, 432, 441, 450, 468, 475]

cp's OEIS Frontend

A347247 Numbers k such that the greatest prime factor of A000593(k) [the sum of their odd divisors] is at least as large as the greatest prime factor of k itself.

Table of values

List of values

n	a(n)
1	1
2	9
3	18
4	25
5	27
6	36
7	45
8	49
9	50
10	54
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	117
21	121
22	125
23	126
24	135
25	144
26	147
27	150
28	162
29	169
30	175
31	180
32	196
33	198
34	200
35	216
36	225
37	234
38	242
39	243
40	245
41	250
42	252
43	270
44	275
45	288
46	289
47	294
48	300
49	315
50	324
51	325
52	338
53	350
54	360
55	361
56	363
57	375
58	392
59	396
60	400
61	405
62	425
63	432
64	441
65	450
66	468
67	475

n	a(n)
1	1
2	9
3	18
4	25
5	27
6	36
7	45
8	49
9	50
10	54
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	117
21	121
22	125
23	126
24	135
25	144
26	147
27	150
28	162
29	169
30	175
31	180
32	196
33	198
34	200
35	216
36	225
37	234
38	242
39	243
40	245
41	250
42	252
43	270
44	275
45	288
46	289
47	294
48	300
49	315
50	324
51	325
52	338
53	350
54	360
55	361
56	363
57	375
58	392
59	396
60	400
61	405
62	425
63	432
64	441
65	450
66	468
67	475

n	a(n)
1	1
2	9
3	18
4	25
5	27
6	36
7	45
8	49
9	50
10	54
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	117
21	121
22	125
23	126
24	135
25	144
26	147
27	150
28	162
29	169
30	175
31	180
32	196
33	198
34	200
35	216
36	225
37	234
38	242
39	243
40	245
41	250
42	252
43	270
44	275
45	288
46	289
47	294
48	300
49	315
50	324
51	325
52	338
53	350
54	360
55	361
56	363
57	375
58	392
59	396
60	400
61	405
62	425
63	432
64	441
65	450
66	468
67	475