A132667 - cp's OEIS frontend

A132667 a(1)=1, a(n) = 3*a(n-1) if the minimal positive integer not yet in the sequence is greater than a(n-1), else a(n) = a(n-1) - 1.

n	a(n)
1	1
2	3
3	2
4	6
5	5
6	4
7	12
8	11
9	10
10	9
11	8
12	7
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	13
22	39
23	38
24	37
25	36
26	35
27	34
28	33
29	32
30	31
31	30
32	29
33	28
34	27
35	26
36	25
37	24
38	23
39	22
40	66
41	65
42	64
43	63
44	62
45	61
46	60
47	59
48	58
49	57
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	49
58	48
59	47
60	46
61	45
62	44
63	43
64	42
65	41
66	40
67	120
68	119
69	118
70	117
71	116

[1, 3, 2, 6, 5, 4, 12, 11, 10, 9, 8, 7, 21, 20, 19, 18, 17, 16, 15, 14, 13, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 120, 119, 118, 117, 116]

cp's OEIS Frontend

A132667 a(1)=1, a(n) = 3*a(n-1) if the minimal positive integer not yet in the sequence is greater than a(n-1), else a(n) = a(n-1) - 1.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	6
5	5
6	4
7	12
8	11
9	10
10	9
11	8
12	7
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	13
22	39
23	38
24	37
25	36
26	35
27	34
28	33
29	32
30	31
31	30
32	29
33	28
34	27
35	26
36	25
37	24
38	23
39	22
40	66
41	65
42	64
43	63
44	62
45	61
46	60
47	59
48	58
49	57
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	49
58	48
59	47
60	46
61	45
62	44
63	43
64	42
65	41
66	40
67	120
68	119
69	118
70	117
71	116

n	a(n)
1	1
2	3
3	2
4	6
5	5
6	4
7	12
8	11
9	10
10	9
11	8
12	7
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	13
22	39
23	38
24	37
25	36
26	35
27	34
28	33
29	32
30	31
31	30
32	29
33	28
34	27
35	26
36	25
37	24
38	23
39	22
40	66
41	65
42	64
43	63
44	62
45	61
46	60
47	59
48	58
49	57
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	49
58	48
59	47
60	46
61	45
62	44
63	43
64	42
65	41
66	40
67	120
68	119
69	118
70	117
71	116

n	a(n)
1	1
2	3
3	2
4	6
5	5
6	4
7	12
8	11
9	10
10	9
11	8
12	7
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	13
22	39
23	38
24	37
25	36
26	35
27	34
28	33
29	32
30	31
31	30
32	29
33	28
34	27
35	26
36	25
37	24
38	23
39	22
40	66
41	65
42	64
43	63
44	62
45	61
46	60
47	59
48	58
49	57
50	56
51	55
52	54
53	53
54	52
55	51
56	50
57	49
58	48
59	47
60	46
61	45
62	44
63	43
64	42
65	41
66	40
67	120
68	119
69	118
70	117
71	116