A290102 - cp's OEIS frontend

A290102 Start from the singleton set S = {n}, and generate on each iteration a new set where each odd number k is replaced by 3k+1, and each even number k is replaced by 3k+1 and k/2. a(n) is the size of the set after the first iteration which has produced a number smaller than n. a(1) = 1 by convention.

n	a(n)
1	1
2	2
3	9
4	2
5	3
6	2
7	52
8	2
9	3
10	2
11	18
12	2
13	3
14	2
15	49
16	2
17	3
18	2
19	9
20	2
21	3
22	2
23	18
24	2
25	3
26	2
27	395
28	2
29	3
30	2
31	1108
32	2
33	3
34	2
35	9
36	2
37	3
38	2
39	52
40	2
41	3
42	2
43	18
44	2
45	3
46	2
47	360
48	2
49	3
50	2
51	9
52	2
53	3
54	2
55	18
56	2
57	3
58	2
59	57
60	2
61	3
62	2
63	1116
64	2
65	3
66	2
67	9
68	2
69	3
70	2
71	115
72	2
73	3
74	2
75	18
76	2
77	3
78	2
79	109
80	2
81	3
82	2
83	9
84	2
85	3
86	2
87	18
88	2
89	3
90	2
91	56
92	2
93	3
94	2
95	105
96	2
97	3
98	2
99	9
100	2
101	3
102	2
103	368
104	2
105	3
106	2
107	18

[1, 2, 9, 2, 3, 2, 52, 2, 3, 2, 18, 2, 3, 2, 49, 2, 3, 2, 9, 2, 3, 2, 18, 2, 3, 2, 395, 2, 3, 2, 1108, 2, 3, 2, 9, 2, 3, 2, 52, 2, 3, 2, 18, 2, 3, 2, 360, 2, 3, 2, 9, 2, 3, 2, 18, 2, 3, 2, 57, 2, 3, 2, 1116, 2, 3, 2, 9, 2, 3, 2, 115, 2, 3, 2, 18, 2, 3, 2, 109, 2, 3, 2, 9, 2, 3, 2, 18, 2, 3, 2, 56, 2, 3, 2, 105, 2, 3, 2, 9, 2, 3, 2, 368, 2, 3, 2, 18]

cp's OEIS Frontend

Table of values

List of values