A050139 - cp's OEIS frontend

A050139 a(1)=2; for n > 1, a(n) = floor(a(n-1)/2) if this is not among 0, a(1), ..., a(n-1); otherwise a(n) = 4*n.

n	a(n)
1	2
2	1
3	12
4	6
5	3
6	24
7	28
8	14
9	7
10	40
11	20
12	10
13	5
14	56
15	60
16	30
17	15
18	72
19	36
20	18
21	9
22	4
23	92
24	46
25	23
26	11
27	108
28	54
29	27
30	13
31	124
32	62
33	31
34	136
35	68
36	34
37	17
38	8
39	156
40	78
41	39
42	19
43	172
44	86
45	43
46	21
47	188
48	94
49	47
50	200
51	100
52	50
53	25
54	216
55	220
56	110
57	55
58	232
59	116

[2, 1, 12, 6, 3, 24, 28, 14, 7, 40, 20, 10, 5, 56, 60, 30, 15, 72, 36, 18, 9, 4, 92, 46, 23, 11, 108, 54, 27, 13, 124, 62, 31, 136, 68, 34, 17, 8, 156, 78, 39, 19, 172, 86, 43, 21, 188, 94, 47, 200, 100, 50, 25, 216, 220, 110, 55, 232, 116]

cp's OEIS Frontend

A050139 a(1)=2; for n > 1, a(n) = floor(a(n-1)/2) if this is not among 0, a(1), ..., a(n-1); otherwise a(n) = 4*n.

Table of values

List of values

n	a(n)
1	2
2	1
3	12
4	6
5	3
6	24
7	28
8	14
9	7
10	40
11	20
12	10
13	5
14	56
15	60
16	30
17	15
18	72
19	36
20	18
21	9
22	4
23	92
24	46
25	23
26	11
27	108
28	54
29	27
30	13
31	124
32	62
33	31
34	136
35	68
36	34
37	17
38	8
39	156
40	78
41	39
42	19
43	172
44	86
45	43
46	21
47	188
48	94
49	47
50	200
51	100
52	50
53	25
54	216
55	220
56	110
57	55
58	232
59	116

n	a(n)
1	2
2	1
3	12
4	6
5	3
6	24
7	28
8	14
9	7
10	40
11	20
12	10
13	5
14	56
15	60
16	30
17	15
18	72
19	36
20	18
21	9
22	4
23	92
24	46
25	23
26	11
27	108
28	54
29	27
30	13
31	124
32	62
33	31
34	136
35	68
36	34
37	17
38	8
39	156
40	78
41	39
42	19
43	172
44	86
45	43
46	21
47	188
48	94
49	47
50	200
51	100
52	50
53	25
54	216
55	220
56	110
57	55
58	232
59	116

n	a(n)
1	2
2	1
3	12
4	6
5	3
6	24
7	28
8	14
9	7
10	40
11	20
12	10
13	5
14	56
15	60
16	30
17	15
18	72
19	36
20	18
21	9
22	4
23	92
24	46
25	23
26	11
27	108
28	54
29	27
30	13
31	124
32	62
33	31
34	136
35	68
36	34
37	17
38	8
39	156
40	78
41	39
42	19
43	172
44	86
45	43
46	21
47	188
48	94
49	47
50	200
51	100
52	50
53	25
54	216
55	220
56	110
57	55
58	232
59	116