A346775 - cp's OEIS frontend

A346775 Starting from 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	5
8	1
9	7
10	1
11	1
12	3
13	1
14	3
15	1
16	1
17	1
18	30
19	1
20	30
21	3
22	7
23	1
24	3
25	3
26	7
27	1
28	1
29	7
30	15
31	3
32	1
33	1
34	3
35	15
36	26
37	15
38	1
39	1
40	1
41	1
42	7
43	7
44	26
45	7
46	1
47	7
48	3
49	1
50	1
51	3
52	1
53	7
54	3
55	7
56	1
57	1
58	26
59	15
60	7
61	30
62	1
63	1
64	1
65	1
66	3
67	15
68	3
69	1
70	1
71	31
72	648
73	26
74	26
75	30
76	90
77	1
78	1
79	3
80	15

[1, 1, 1, 1, 1, 1, 3, 5, 1, 7, 1, 1, 3, 1, 3, 1, 1, 1, 30, 1, 30, 3, 7, 1, 3, 3, 7, 1, 1, 7, 15, 3, 1, 1, 3, 15, 26, 15, 1, 1, 1, 1, 7, 7, 26, 7, 1, 7, 3, 1, 1, 3, 1, 7, 3, 7, 1, 1, 26, 15, 7, 30, 1, 1, 1, 1, 3, 15, 3, 1, 1, 31, 648, 26, 26, 30, 90, 1, 1, 3, 15]

cp's OEIS Frontend

A346775 Starting from 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	5
8	1
9	7
10	1
11	1
12	3
13	1
14	3
15	1
16	1
17	1
18	30
19	1
20	30
21	3
22	7
23	1
24	3
25	3
26	7
27	1
28	1
29	7
30	15
31	3
32	1
33	1
34	3
35	15
36	26
37	15
38	1
39	1
40	1
41	1
42	7
43	7
44	26
45	7
46	1
47	7
48	3
49	1
50	1
51	3
52	1
53	7
54	3
55	7
56	1
57	1
58	26
59	15
60	7
61	30
62	1
63	1
64	1
65	1
66	3
67	15
68	3
69	1
70	1
71	31
72	648
73	26
74	26
75	30
76	90
77	1
78	1
79	3
80	15

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	3
7	5
8	1
9	7
10	1
11	1
12	3
13	1
14	3
15	1
16	1
17	1
18	30
19	1
20	30
21	3
22	7
23	1
24	3
25	3
26	7
27	1
28	1
29	7
30	15
31	3
32	1
33	1
34	3
35	15
36	26
37	15
38	1
39	1
40	1
41	1
42	7
43	7
44	26
45	7
46	1
47	7
48	3
49	1
50	1
51	3
52	1
53	7
54	3
55	7
56	1
57	1
58	26
59	15
60	7
61	30
62	1
63	1
64	1
65	1
66	3
67	15
68	3
69	1
70	1
71	31
72	648
73	26
74	26
75	30
76	90
77	1
78	1
79	3
80	15

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	3
7	5
8	1
9	7
10	1
11	1
12	3
13	1
14	3
15	1
16	1
17	1
18	30
19	1
20	30
21	3
22	7
23	1
24	3
25	3
26	7
27	1
28	1
29	7
30	15
31	3
32	1
33	1
34	3
35	15
36	26
37	15
38	1
39	1
40	1
41	1
42	7
43	7
44	26
45	7
46	1
47	7
48	3
49	1
50	1
51	3
52	1
53	7
54	3
55	7
56	1
57	1
58	26
59	15
60	7
61	30
62	1
63	1
64	1
65	1
66	3
67	15
68	3
69	1
70	1
71	31
72	648
73	26
74	26
75	30
76	90
77	1
78	1
79	3
80	15