A063139 - cp's OEIS frontend

A063139 Composite numbers which in base 3 contain their largest proper factor as a substring.

n	a(n)
1	9
2	15
3	21
4	27
5	33
6	39
7	45
8	49
9	51
10	57
11	63
12	69
13	75
14	81
15	87
16	93
17	99
18	105
19	111
20	117
21	123
22	129
23	135
24	141
25	147
26	153
27	159
28	165
29	171
30	177
31	183
32	189
33	195
34	201
35	207
36	213
37	219
38	225
39	231
40	237
41	243
42	249
43	255
44	261
45	267
46	273
47	279
48	285
49	291
50	297

[9, 15, 21, 27, 33, 39, 45, 49, 51, 57, 63, 69, 75, 81, 87, 93, 99, 105, 111, 117, 123, 129, 135, 141, 147, 153, 159, 165, 171, 177, 183, 189, 195, 201, 207, 213, 219, 225, 231, 237, 243, 249, 255, 261, 267, 273, 279, 285, 291, 297]

cp's OEIS Frontend

A063139 Composite numbers which in base 3 contain their largest proper factor as a substring.

Table of values

List of values

n	a(n)
1	9
2	15
3	21
4	27
5	33
6	39
7	45
8	49
9	51
10	57
11	63
12	69
13	75
14	81
15	87
16	93
17	99
18	105
19	111
20	117
21	123
22	129
23	135
24	141
25	147
26	153
27	159
28	165
29	171
30	177
31	183
32	189
33	195
34	201
35	207
36	213
37	219
38	225
39	231
40	237
41	243
42	249
43	255
44	261
45	267
46	273
47	279
48	285
49	291
50	297

n	a(n)
1	9
2	15
3	21
4	27
5	33
6	39
7	45
8	49
9	51
10	57
11	63
12	69
13	75
14	81
15	87
16	93
17	99
18	105
19	111
20	117
21	123
22	129
23	135
24	141
25	147
26	153
27	159
28	165
29	171
30	177
31	183
32	189
33	195
34	201
35	207
36	213
37	219
38	225
39	231
40	237
41	243
42	249
43	255
44	261
45	267
46	273
47	279
48	285
49	291
50	297

n	a(n)
1	9
2	15
3	21
4	27
5	33
6	39
7	45
8	49
9	51
10	57
11	63
12	69
13	75
14	81
15	87
16	93
17	99
18	105
19	111
20	117
21	123
22	129
23	135
24	141
25	147
26	153
27	159
28	165
29	171
30	177
31	183
32	189
33	195
34	201
35	207
36	213
37	219
38	225
39	231
40	237
41	243
42	249
43	255
44	261
45	267
46	273
47	279
48	285
49	291
50	297