A050138 - cp's OEIS frontend

A050138 a(1)=2, a(2)=6. For n >= 2, a(n) = floor(a(n-1)/2) if this is not among 0,a(1),...,a(n-1); otherwise a(n) = 3*n.

n	a(n)
1	2
2	6
3	3
4	1
5	15
6	7
7	21
8	10
9	5
10	30
11	33
12	16
13	8
14	4
15	45
16	22
17	11
18	54
19	27
20	13
21	63
22	31
23	69
24	34
25	17
26	78
27	39
28	19
29	9
30	90
31	93
32	46
33	23
34	102
35	51
36	25
37	12
38	114
39	57
40	28
41	14
42	126
43	129
44	64
45	32
46	138
47	141
48	70
49	35
50	150
51	75
52	37
53	18
54	162
55	81
56	40
57	20
58	174
59	87
60	43

[2, 6, 3, 1, 15, 7, 21, 10, 5, 30, 33, 16, 8, 4, 45, 22, 11, 54, 27, 13, 63, 31, 69, 34, 17, 78, 39, 19, 9, 90, 93, 46, 23, 102, 51, 25, 12, 114, 57, 28, 14, 126, 129, 64, 32, 138, 141, 70, 35, 150, 75, 37, 18, 162, 81, 40, 20, 174, 87, 43]

cp's OEIS Frontend

A050138 a(1)=2, a(2)=6. For n >= 2, a(n) = floor(a(n-1)/2) if this is not among 0,a(1),...,a(n-1); otherwise a(n) = 3*n.

Table of values

List of values

n	a(n)
1	2
2	6
3	3
4	1
5	15
6	7
7	21
8	10
9	5
10	30
11	33
12	16
13	8
14	4
15	45
16	22
17	11
18	54
19	27
20	13
21	63
22	31
23	69
24	34
25	17
26	78
27	39
28	19
29	9
30	90
31	93
32	46
33	23
34	102
35	51
36	25
37	12
38	114
39	57
40	28
41	14
42	126
43	129
44	64
45	32
46	138
47	141
48	70
49	35
50	150
51	75
52	37
53	18
54	162
55	81
56	40
57	20
58	174
59	87
60	43

n	a(n)
1	2
2	6
3	3
4	1
5	15
6	7
7	21
8	10
9	5
10	30
11	33
12	16
13	8
14	4
15	45
16	22
17	11
18	54
19	27
20	13
21	63
22	31
23	69
24	34
25	17
26	78
27	39
28	19
29	9
30	90
31	93
32	46
33	23
34	102
35	51
36	25
37	12
38	114
39	57
40	28
41	14
42	126
43	129
44	64
45	32
46	138
47	141
48	70
49	35
50	150
51	75
52	37
53	18
54	162
55	81
56	40
57	20
58	174
59	87
60	43

n	a(n)
1	2
2	6
3	3
4	1
5	15
6	7
7	21
8	10
9	5
10	30
11	33
12	16
13	8
14	4
15	45
16	22
17	11
18	54
19	27
20	13
21	63
22	31
23	69
24	34
25	17
26	78
27	39
28	19
29	9
30	90
31	93
32	46
33	23
34	102
35	51
36	25
37	12
38	114
39	57
40	28
41	14
42	126
43	129
44	64
45	32
46	138
47	141
48	70
49	35
50	150
51	75
52	37
53	18
54	162
55	81
56	40
57	20
58	174
59	87
60	43