A147991 - cp's OEIS frontend

A147991 Sequence S such that 1 is in S and if x is in S, then 3x-1 and 3x+1 are in S.

n	a(n)
1	1
2	2
3	4
4	5
5	7
6	11
7	13
8	14
9	16
10	20
11	22
12	32
13	34
14	38
15	40
16	41
17	43
18	47
19	49
20	59
21	61
22	65
23	67
24	95
25	97
26	101
27	103
28	113
29	115
30	119
31	121
32	122
33	124
34	128
35	130
36	140
37	142
38	146
39	148
40	176
41	178
42	182
43	184
44	194
45	196
46	200
47	202
48	284
49	286
50	290
51	292
52	302
53	304
54	308
55	310
56	338
57	340
58	344
59	346

[1, 2, 4, 5, 7, 11, 13, 14, 16, 20, 22, 32, 34, 38, 40, 41, 43, 47, 49, 59, 61, 65, 67, 95, 97, 101, 103, 113, 115, 119, 121, 122, 124, 128, 130, 140, 142, 146, 148, 176, 178, 182, 184, 194, 196, 200, 202, 284, 286, 290, 292, 302, 304, 308, 310, 338, 340, 344, 346]

cp's OEIS Frontend

A147991 Sequence S such that 1 is in S and if x is in S, then 3x-1 and 3x+1 are in S.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	5
5	7
6	11
7	13
8	14
9	16
10	20
11	22
12	32
13	34
14	38
15	40
16	41
17	43
18	47
19	49
20	59
21	61
22	65
23	67
24	95
25	97
26	101
27	103
28	113
29	115
30	119
31	121
32	122
33	124
34	128
35	130
36	140
37	142
38	146
39	148
40	176
41	178
42	182
43	184
44	194
45	196
46	200
47	202
48	284
49	286
50	290
51	292
52	302
53	304
54	308
55	310
56	338
57	340
58	344
59	346

n	a(n)
1	1
2	2
3	4
4	5
5	7
6	11
7	13
8	14
9	16
10	20
11	22
12	32
13	34
14	38
15	40
16	41
17	43
18	47
19	49
20	59
21	61
22	65
23	67
24	95
25	97
26	101
27	103
28	113
29	115
30	119
31	121
32	122
33	124
34	128
35	130
36	140
37	142
38	146
39	148
40	176
41	178
42	182
43	184
44	194
45	196
46	200
47	202
48	284
49	286
50	290
51	292
52	302
53	304
54	308
55	310
56	338
57	340
58	344
59	346

n	a(n)
1	1
2	2
3	4
4	5
5	7
6	11
7	13
8	14
9	16
10	20
11	22
12	32
13	34
14	38
15	40
16	41
17	43
18	47
19	49
20	59
21	61
22	65
23	67
24	95
25	97
26	101
27	103
28	113
29	115
30	119
31	121
32	122
33	124
34	128
35	130
36	140
37	142
38	146
39	148
40	176
41	178
42	182
43	184
44	194
45	196
46	200
47	202
48	284
49	286
50	290
51	292
52	302
53	304
54	308
55	310
56	338
57	340
58	344
59	346