A261831 - cp's OEIS frontend

A261831 a(2n-1) = 2n-1; otherwise a(n) is the smallest even number not already present which is obtained from the existing terms by the rules of (3*n+1)-problem.

n	a(n)
1	1
2	4
3	3
4	2
5	5
6	10
7	7
8	16
9	9
10	8
11	11
12	22
13	13
14	28
15	15
16	14
17	17
18	34
19	19
20	40
21	21
22	20
23	23
24	46
25	25
26	52
27	27
28	26
29	29
30	58
31	31
32	64
33	33
34	32
35	35
36	70
37	37
38	76
39	39
40	38
41	41
42	82
43	43
44	88
45	45
46	44
47	47
48	94
49	49
50	100
51	51
52	50
53	53
54	106
55	55
56	112
57	57
58	56
59	59
60	118
61	61
62	124
63	63
64	62
65	65
66	130
67	67
68	136
69	69
70	68
71	71
72	142
73	73
74	148
75	75
76	74
77	77
78	154
79	79
80	160
81	81
82	80

[1, 4, 3, 2, 5, 10, 7, 16, 9, 8, 11, 22, 13, 28, 15, 14, 17, 34, 19, 40, 21, 20, 23, 46, 25, 52, 27, 26, 29, 58, 31, 64, 33, 32, 35, 70, 37, 76, 39, 38, 41, 82, 43, 88, 45, 44, 47, 94, 49, 100, 51, 50, 53, 106, 55, 112, 57, 56, 59, 118, 61, 124, 63, 62, 65, 130, 67, 136, 69, 68, 71, 142, 73, 148, 75, 74, 77, 154, 79, 160, 81, 80]

cp's OEIS Frontend

A261831 a(2n-1) = 2n-1; otherwise a(n) is the smallest even number not already present which is obtained from the existing terms by the rules of (3*n+1)-problem.

Table of values

List of values

n	a(n)
1	1
2	4
3	3
4	2
5	5
6	10
7	7
8	16
9	9
10	8
11	11
12	22
13	13
14	28
15	15
16	14
17	17
18	34
19	19
20	40
21	21
22	20
23	23
24	46
25	25
26	52
27	27
28	26
29	29
30	58
31	31
32	64
33	33
34	32
35	35
36	70
37	37
38	76
39	39
40	38
41	41
42	82
43	43
44	88
45	45
46	44
47	47
48	94
49	49
50	100
51	51
52	50
53	53
54	106
55	55
56	112
57	57
58	56
59	59
60	118
61	61
62	124
63	63
64	62
65	65
66	130
67	67
68	136
69	69
70	68
71	71
72	142
73	73
74	148
75	75
76	74
77	77
78	154
79	79
80	160
81	81
82	80

n	a(n)
1	1
2	4
3	3
4	2
5	5
6	10
7	7
8	16
9	9
10	8
11	11
12	22
13	13
14	28
15	15
16	14
17	17
18	34
19	19
20	40
21	21
22	20
23	23
24	46
25	25
26	52
27	27
28	26
29	29
30	58
31	31
32	64
33	33
34	32
35	35
36	70
37	37
38	76
39	39
40	38
41	41
42	82
43	43
44	88
45	45
46	44
47	47
48	94
49	49
50	100
51	51
52	50
53	53
54	106
55	55
56	112
57	57
58	56
59	59
60	118
61	61
62	124
63	63
64	62
65	65
66	130
67	67
68	136
69	69
70	68
71	71
72	142
73	73
74	148
75	75
76	74
77	77
78	154
79	79
80	160
81	81
82	80

cp's OEIS Frontend

A261831 a(2*n-1) = 2*n-1; otherwise a(n) is the smallest even number not already present which is obtained from the existing terms by the rules of (3*n+1)-problem.

Table of values

List of values

A261831 a(2n-1) = 2n-1; otherwise a(n) is the smallest even number not already present which is obtained from the existing terms by the rules of (3*n+1)-problem.

n	a(n)
1	1
2	4
3	3
4	2
5	5
6	10
7	7
8	16
9	9
10	8
11	11
12	22
13	13
14	28
15	15
16	14
17	17
18	34
19	19
20	40
21	21
22	20
23	23
24	46
25	25
26	52
27	27
28	26
29	29
30	58
31	31
32	64
33	33
34	32
35	35
36	70
37	37
38	76
39	39
40	38
41	41
42	82
43	43
44	88
45	45
46	44
47	47
48	94
49	49
50	100
51	51
52	50
53	53
54	106
55	55
56	112
57	57
58	56
59	59
60	118
61	61
62	124
63	63
64	62
65	65
66	130
67	67
68	136
69	69
70	68
71	71
72	142
73	73
74	148
75	75
76	74
77	77
78	154
79	79
80	160
81	81
82	80