A277109 - cp's OEIS frontend

A277109 Starting from 2^n+1, the length of the longest sequence of consecutive numbers which all take the same number of steps to reach 1 in the Collatz (or '3x+1') problem.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	3
9	1
10	3
11	1
12	1
13	1
14	3
15	1
16	3
17	7
18	15
19	30
20	1
21	1
22	3
23	7
24	15
25	26
26	26
27	1
28	1
29	1
30	3
31	1
32	3
33	1
34	3
35	1
36	1
37	1
38	3
39	1
40	3
41	7
42	15
43	1
44	1
45	1
46	3
47	1
48	3
49	1
50	3
51	1
52	1
53	1
54	3
55	1
56	3
57	7
58	15
59	1
60	1
61	3
62	7
63	15
64	26
65	1
66	3
67	7
68	15
69	31
70	63
71	26
72	30
73	26
74	26
75	26
76	26
77	30
78	46
79	26
80	26
81	26
82	26
83	1
84	1
85	1
86	3
87	7
88	15
89	1
90	3
91	1

[1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 3, 7, 15, 30, 1, 1, 3, 7, 15, 26, 26, 1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 3, 7, 15, 1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 3, 7, 15, 1, 1, 3, 7, 15, 26, 1, 3, 7, 15, 31, 63, 26, 30, 26, 26, 26, 26, 30, 46, 26, 26, 26, 26, 1, 1, 1, 3, 7, 15, 1, 3, 1]

cp's OEIS Frontend

A277109 Starting from 2^n+1, the length of the longest sequence of consecutive numbers which all take the same number of steps to reach 1 in the Collatz (or '3x+1') problem.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	3
9	1
10	3
11	1
12	1
13	1
14	3
15	1
16	3
17	7
18	15
19	30
20	1
21	1
22	3
23	7
24	15
25	26
26	26
27	1
28	1
29	1
30	3
31	1
32	3
33	1
34	3
35	1
36	1
37	1
38	3
39	1
40	3
41	7
42	15
43	1
44	1
45	1
46	3
47	1
48	3
49	1
50	3
51	1
52	1
53	1
54	3
55	1
56	3
57	7
58	15
59	1
60	1
61	3
62	7
63	15
64	26
65	1
66	3
67	7
68	15
69	31
70	63
71	26
72	30
73	26
74	26
75	26
76	26
77	30
78	46
79	26
80	26
81	26
82	26
83	1
84	1
85	1
86	3
87	7
88	15
89	1
90	3
91	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	3
9	1
10	3
11	1
12	1
13	1
14	3
15	1
16	3
17	7
18	15
19	30
20	1
21	1
22	3
23	7
24	15
25	26
26	26
27	1
28	1
29	1
30	3
31	1
32	3
33	1
34	3
35	1
36	1
37	1
38	3
39	1
40	3
41	7
42	15
43	1
44	1
45	1
46	3
47	1
48	3
49	1
50	3
51	1
52	1
53	1
54	3
55	1
56	3
57	7
58	15
59	1
60	1
61	3
62	7
63	15
64	26
65	1
66	3
67	7
68	15
69	31
70	63
71	26
72	30
73	26
74	26
75	26
76	26
77	30
78	46
79	26
80	26
81	26
82	26
83	1
84	1
85	1
86	3
87	7
88	15
89	1
90	3
91	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	3
7	1
8	3
9	1
10	3
11	1
12	1
13	1
14	3
15	1
16	3
17	7
18	15
19	30
20	1
21	1
22	3
23	7
24	15
25	26
26	26
27	1
28	1
29	1
30	3
31	1
32	3
33	1
34	3
35	1
36	1
37	1
38	3
39	1
40	3
41	7
42	15
43	1
44	1
45	1
46	3
47	1
48	3
49	1
50	3
51	1
52	1
53	1
54	3
55	1
56	3
57	7
58	15
59	1
60	1
61	3
62	7
63	15
64	26
65	1
66	3
67	7
68	15
69	31
70	63
71	26
72	30
73	26
74	26
75	26
76	26
77	30
78	46
79	26
80	26
81	26
82	26
83	1
84	1
85	1
86	3
87	7
88	15
89	1
90	3
91	1