A132669 - cp's OEIS frontend

A132669 a(1)=1, a(n) = 5*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	5
3	4
4	3
5	2
6	10
7	9
8	8
9	7
10	6
11	30
12	29
13	28
14	27
15	26
16	25
17	24
18	23
19	22
20	21
21	20
22	19
23	18
24	17
25	16
26	15
27	14
28	13
29	12
30	11
31	55
32	54
33	53
34	52
35	51
36	50
37	49
38	48
39	47
40	46
41	45
42	44
43	43
44	42
45	41
46	40
47	39
48	38
49	37
50	36
51	35
52	34
53	33
54	32
55	31
56	155
57	154
58	153
59	152
60	151
61	150
62	149
63	148
64	147
65	146
66	145
67	144
68	143

[1, 5, 4, 3, 2, 10, 9, 8, 7, 6, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 155, 154, 153, 152, 151, 150, 149, 148, 147, 146, 145, 144, 143]

cp's OEIS Frontend

A132669 a(1)=1, a(n) = 5*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	5
3	4
4	3
5	2
6	10
7	9
8	8
9	7
10	6
11	30
12	29
13	28
14	27
15	26
16	25
17	24
18	23
19	22
20	21
21	20
22	19
23	18
24	17
25	16
26	15
27	14
28	13
29	12
30	11
31	55
32	54
33	53
34	52
35	51
36	50
37	49
38	48
39	47
40	46
41	45
42	44
43	43
44	42
45	41
46	40
47	39
48	38
49	37
50	36
51	35
52	34
53	33
54	32
55	31
56	155
57	154
58	153
59	152
60	151
61	150
62	149
63	148
64	147
65	146
66	145
67	144
68	143

n	a(n)
1	1
2	5
3	4
4	3
5	2
6	10
7	9
8	8
9	7
10	6
11	30
12	29
13	28
14	27
15	26
16	25
17	24
18	23
19	22
20	21
21	20
22	19
23	18
24	17
25	16
26	15
27	14
28	13
29	12
30	11
31	55
32	54
33	53
34	52
35	51
36	50
37	49
38	48
39	47
40	46
41	45
42	44
43	43
44	42
45	41
46	40
47	39
48	38
49	37
50	36
51	35
52	34
53	33
54	32
55	31
56	155
57	154
58	153
59	152
60	151
61	150
62	149
63	148
64	147
65	146
66	145
67	144
68	143

n	a(n)
1	1
2	5
3	4
4	3
5	2
6	10
7	9
8	8
9	7
10	6
11	30
12	29
13	28
14	27
15	26
16	25
17	24
18	23
19	22
20	21
21	20
22	19
23	18
24	17
25	16
26	15
27	14
28	13
29	12
30	11
31	55
32	54
33	53
34	52
35	51
36	50
37	49
38	48
39	47
40	46
41	45
42	44
43	43
44	42
45	41
46	40
47	39
48	38
49	37
50	36
51	35
52	34
53	33
54	32
55	31
56	155
57	154
58	153
59	152
60	151
61	150
62	149
63	148
64	147
65	146
66	145
67	144
68	143