A078417 - cp's OEIS frontend

A078417 Numbers k such that h(k) = h(k+1), where h(k) is the length of k, f(k), f(f(k)), ..., 1 in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)

n	a(n)
1	12
2	14
3	18
4	20
5	22
6	28
7	29
8	34
9	36
10	37
11	44
12	45
13	49
14	50
15	52
16	54
17	60
18	62
19	65
20	66
21	68
22	69
23	76
24	78
25	82
26	84
27	86
28	92
29	94
30	98
31	99
32	100
33	101
34	108
35	109
36	114
37	116
38	118
39	124
40	125
41	130
42	131
43	132
44	133
45	140
46	142
47	145
48	146
49	148
50	150
51	156
52	157
53	162
54	164
55	165
56	172
57	173
58	177
59	178

[12, 14, 18, 20, 22, 28, 29, 34, 36, 37, 44, 45, 49, 50, 52, 54, 60, 62, 65, 66, 68, 69, 76, 78, 82, 84, 86, 92, 94, 98, 99, 100, 101, 108, 109, 114, 116, 118, 124, 125, 130, 131, 132, 133, 140, 142, 145, 146, 148, 150, 156, 157, 162, 164, 165, 172, 173, 177, 178]

cp's OEIS Frontend

A078417 Numbers k such that h(k) = h(k+1), where h(k) is the length of k, f(k), f(f(k)), ..., 1 in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)

Table of values

List of values

n	a(n)
1	12
2	14
3	18
4	20
5	22
6	28
7	29
8	34
9	36
10	37
11	44
12	45
13	49
14	50
15	52
16	54
17	60
18	62
19	65
20	66
21	68
22	69
23	76
24	78
25	82
26	84
27	86
28	92
29	94
30	98
31	99
32	100
33	101
34	108
35	109
36	114
37	116
38	118
39	124
40	125
41	130
42	131
43	132
44	133
45	140
46	142
47	145
48	146
49	148
50	150
51	156
52	157
53	162
54	164
55	165
56	172
57	173
58	177
59	178

n	a(n)
1	12
2	14
3	18
4	20
5	22
6	28
7	29
8	34
9	36
10	37
11	44
12	45
13	49
14	50
15	52
16	54
17	60
18	62
19	65
20	66
21	68
22	69
23	76
24	78
25	82
26	84
27	86
28	92
29	94
30	98
31	99
32	100
33	101
34	108
35	109
36	114
37	116
38	118
39	124
40	125
41	130
42	131
43	132
44	133
45	140
46	142
47	145
48	146
49	148
50	150
51	156
52	157
53	162
54	164
55	165
56	172
57	173
58	177
59	178

n	a(n)
1	12
2	14
3	18
4	20
5	22
6	28
7	29
8	34
9	36
10	37
11	44
12	45
13	49
14	50
15	52
16	54
17	60
18	62
19	65
20	66
21	68
22	69
23	76
24	78
25	82
26	84
27	86
28	92
29	94
30	98
31	99
32	100
33	101
34	108
35	109
36	114
37	116
38	118
39	124
40	125
41	130
42	131
43	132
44	133
45	140
46	142
47	145
48	146
49	148
50	150
51	156
52	157
53	162
54	164
55	165
56	172
57	173
58	177
59	178