A347242 - cp's OEIS frontend

A347242 Numbers k such that when iterating the map x -> A000593(x), at some point before 1 is reached (after starting from x=k), a term is encountered whose largest prime factor is at least as large as A006530(k).

n	a(n)
1	9
2	18
3	25
4	27
5	36
6	45
7	49
8	50
9	54
10	55
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	110
21	117
22	121
23	125
24	126
25	135
26	144
27	147
28	150
29	162
30	165
31	169
32	175
33	180
34	196
35	198
36	200
37	216
38	220
39	225
40	234
41	242
42	243
43	245
44	250
45	252
46	270
47	275
48	288
49	289
50	294
51	300
52	315
53	324
54	325
55	330
56	338
57	343
58	350
59	360
60	361
61	363
62	375
63	385
64	392
65	396
66	400

[9, 18, 25, 27, 36, 45, 49, 50, 54, 55, 63, 72, 75, 81, 90, 98, 99, 100, 108, 110, 117, 121, 125, 126, 135, 144, 147, 150, 162, 165, 169, 175, 180, 196, 198, 200, 216, 220, 225, 234, 242, 243, 245, 250, 252, 270, 275, 288, 289, 294, 300, 315, 324, 325, 330, 338, 343, 350, 360, 361, 363, 375, 385, 392, 396, 400]

cp's OEIS Frontend

A347242 Numbers k such that when iterating the map x -> A000593(x), at some point before 1 is reached (after starting from x=k), a term is encountered whose largest prime factor is at least as large as A006530(k).

Table of values

List of values

n	a(n)
1	9
2	18
3	25
4	27
5	36
6	45
7	49
8	50
9	54
10	55
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	110
21	117
22	121
23	125
24	126
25	135
26	144
27	147
28	150
29	162
30	165
31	169
32	175
33	180
34	196
35	198
36	200
37	216
38	220
39	225
40	234
41	242
42	243
43	245
44	250
45	252
46	270
47	275
48	288
49	289
50	294
51	300
52	315
53	324
54	325
55	330
56	338
57	343
58	350
59	360
60	361
61	363
62	375
63	385
64	392
65	396
66	400

n	a(n)
1	9
2	18
3	25
4	27
5	36
6	45
7	49
8	50
9	54
10	55
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	110
21	117
22	121
23	125
24	126
25	135
26	144
27	147
28	150
29	162
30	165
31	169
32	175
33	180
34	196
35	198
36	200
37	216
38	220
39	225
40	234
41	242
42	243
43	245
44	250
45	252
46	270
47	275
48	288
49	289
50	294
51	300
52	315
53	324
54	325
55	330
56	338
57	343
58	350
59	360
60	361
61	363
62	375
63	385
64	392
65	396
66	400

n	a(n)
1	9
2	18
3	25
4	27
5	36
6	45
7	49
8	50
9	54
10	55
11	63
12	72
13	75
14	81
15	90
16	98
17	99
18	100
19	108
20	110
21	117
22	121
23	125
24	126
25	135
26	144
27	147
28	150
29	162
30	165
31	169
32	175
33	180
34	196
35	198
36	200
37	216
38	220
39	225
40	234
41	242
42	243
43	245
44	250
45	252
46	270
47	275
48	288
49	289
50	294
51	300
52	315
53	324
54	325
55	330
56	338
57	343
58	350
59	360
60	361
61	363
62	375
63	385
64	392
65	396
66	400