A063041 - cp's OEIS frontend

A063041 Image of n under Collatz-2 map, a generalization of the classical '3x+1' - function: instead of dividing an even number by 2 a nonprime will be divided by its smallest prime factor and a prime will be multiplied not by 3 but by its prime-predecessor, before one is added.

n	a(n)
2	3
3	7
4	2
5	16
6	3
7	36
8	4
9	3
10	5
11	78
12	6
13	144
14	7
15	5
16	8
17	222
18	9
19	324
20	10
21	7
22	11
23	438
24	12
25	5
26	13
27	9
28	14
29	668
30	15
31	900
32	16
33	11
34	17
35	7
36	18
37	1148
38	19
39	13
40	20
41	1518
42	21
43	1764
44	22
45	15
46	23
47	2022
48	24
49	7
50	25
51	17
52	26
53	2492
54	27
55	11
56	28
57	19
58	29
59	3128
60	30
61	3600
62	31
63	21
64	32
65	13
66	33
67	4088
68	34
69	23

[3, 7, 2, 16, 3, 36, 4, 3, 5, 78, 6, 144, 7, 5, 8, 222, 9, 324, 10, 7, 11, 438, 12, 5, 13, 9, 14, 668, 15, 900, 16, 11, 17, 7, 18, 1148, 19, 13, 20, 1518, 21, 1764, 22, 15, 23, 2022, 24, 7, 25, 17, 26, 2492, 27, 11, 28, 19, 29, 3128, 30, 3600, 31, 21, 32, 13, 33, 4088, 34, 23]

cp's OEIS Frontend

A063041 Image of n under Collatz-2 map, a generalization of the classical '3x+1' - function: instead of dividing an even number by 2 a nonprime will be divided by its smallest prime factor and a prime will be multiplied not by 3 but by its prime-predecessor, before one is added.

Table of values

List of values