A076138 - cp's OEIS frontend

A076138 a(1)=1; a(n+1) is the smallest integer > a(n) such that C_2k(a(n+1))=C_2k(a(n)) for k large enough, where C_m(n) is the modified Collatz map iterated m times on n ( x->x/2 if x is even x->(3x+1)/2 if x is odd).

n	a(n)
1	1
2	4
3	5
4	6
5	11
6	14
7	15
8	16
9	18
10	19
11	20
12	21
13	24
14	25
15	26
16	27
17	33
18	34
19	35
20	43
21	44
22	45
23	46
24	47
25	56
26	57
27	58
28	59
29	60
30	61
31	62
32	63
33	64
34	72
35	74
36	76
37	77
38	78
39	79
40	80
41	81
42	82
43	83
44	84
45	85
46	96
47	98
48	99
49	100
50	101
51	102
52	103
53	104
54	105
55	106
56	107
57	108
58	109
59	110
60	113
61	130
62	131
63	132
64	133
65	134
66	135

[1, 4, 5, 6, 11, 14, 15, 16, 18, 19, 20, 21, 24, 25, 26, 27, 33, 34, 35, 43, 44, 45, 46, 47, 56, 57, 58, 59, 60, 61, 62, 63, 64, 72, 74, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 96, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 113, 130, 131, 132, 133, 134, 135]

cp's OEIS Frontend

A076138 a(1)=1; a(n+1) is the smallest integer > a(n) such that C_2k(a(n+1))=C_2k(a(n)) for k large enough, where C_m(n) is the modified Collatz map iterated m times on n ( x->x/2 if x is even x->(3x+1)/2 if x is odd).

Table of values

List of values

n	a(n)
1	1
2	4
3	5
4	6
5	11
6	14
7	15
8	16
9	18
10	19
11	20
12	21
13	24
14	25
15	26
16	27
17	33
18	34
19	35
20	43
21	44
22	45
23	46
24	47
25	56
26	57
27	58
28	59
29	60
30	61
31	62
32	63
33	64
34	72
35	74
36	76
37	77
38	78
39	79
40	80
41	81
42	82
43	83
44	84
45	85
46	96
47	98
48	99
49	100
50	101
51	102
52	103
53	104
54	105
55	106
56	107
57	108
58	109
59	110
60	113
61	130
62	131
63	132
64	133
65	134
66	135

n	a(n)
1	1
2	4
3	5
4	6
5	11
6	14
7	15
8	16
9	18
10	19
11	20
12	21
13	24
14	25
15	26
16	27
17	33
18	34
19	35
20	43
21	44
22	45
23	46
24	47
25	56
26	57
27	58
28	59
29	60
30	61
31	62
32	63
33	64
34	72
35	74
36	76
37	77
38	78
39	79
40	80
41	81
42	82
43	83
44	84
45	85
46	96
47	98
48	99
49	100
50	101
51	102
52	103
53	104
54	105
55	106
56	107
57	108
58	109
59	110
60	113
61	130
62	131
63	132
64	133
65	134
66	135

n	a(n)
1	1
2	4
3	5
4	6
5	11
6	14
7	15
8	16
9	18
10	19
11	20
12	21
13	24
14	25
15	26
16	27
17	33
18	34
19	35
20	43
21	44
22	45
23	46
24	47
25	56
26	57
27	58
28	59
29	60
30	61
31	62
32	63
33	64
34	72
35	74
36	76
37	77
38	78
39	79
40	80
41	81
42	82
43	83
44	84
45	85
46	96
47	98
48	99
49	100
50	101
51	102
52	103
53	104
54	105
55	106
56	107
57	108
58	109
59	110
60	113
61	130
62	131
63	132
64	133
65	134
66	135