A348433 - cp's OEIS frontend

A348433 a(1) = 1; a(n+1) = 2*a(n) if the digit sum of a(n) is already in the sequence, otherwise a(n+1) = digitsum(a(n)).

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	7
7	14
8	5
9	10
10	20
11	40
12	80
13	160
14	320
15	640
16	1280
17	11
18	22
19	44
20	88
21	176
22	352
23	704
24	1408
25	13
26	26
27	52
28	104
29	208
30	416
31	832
32	1664
33	17
34	34
35	68
36	136
37	272
38	544
39	1088
40	2176
41	4352
42	8704
43	19
44	38
45	76
46	152
47	304
48	608
49	1216
50	2432
51	4864
52	9728
53	19456
54	25
55	50
56	100
57	200

[1, 2, 4, 8, 16, 7, 14, 5, 10, 20, 40, 80, 160, 320, 640, 1280, 11, 22, 44, 88, 176, 352, 704, 1408, 13, 26, 52, 104, 208, 416, 832, 1664, 17, 34, 68, 136, 272, 544, 1088, 2176, 4352, 8704, 19, 38, 76, 152, 304, 608, 1216, 2432, 4864, 9728, 19456, 25, 50, 100, 200]

cp's OEIS Frontend

A348433 a(1) = 1; a(n+1) = 2*a(n) if the digit sum of a(n) is already in the sequence, otherwise a(n+1) = digitsum(a(n)).

Table of values

List of values