A121175 - cp's OEIS frontend

A121175 Sequence S with the following properties: (i) a(1)=2; (ii) for n is S, a(n)=a(1)+a(2)+...+a(n-1); (iii) for n not in S, a(n)=the smallest number different from a(1), ..., a(n-1) not breaking property (ii).

n	a(n)
1	2
2	2
3	4
4	8
5	3
6	7
7	26
8	52
9	10
10	114
11	12
12	240
13	14
14	494
15	16
16	1004
17	18
18	2026
19	20
20	4072
21	22
22	8166
23	24
24	16356
25	27
26	32739
27	65478
28	29
29	130985
30	31
31	262001
32	33
33	524035
34	35
35	1048105
36	37
37	2096247
38	39
39	4192533
40	41
41	8385107
42	43
43	16770257
44	45
45	33540559

[2, 2, 4, 8, 3, 7, 26, 52, 10, 114, 12, 240, 14, 494, 16, 1004, 18, 2026, 20, 4072, 22, 8166, 24, 16356, 27, 32739, 65478, 29, 130985, 31, 262001, 33, 524035, 35, 1048105, 37, 2096247, 39, 4192533, 41, 8385107, 43, 16770257, 45, 33540559]

cp's OEIS Frontend

A121175 Sequence S with the following properties: (i) a(1)=2; (ii) for n is S, a(n)=a(1)+a(2)+...+a(n-1); (iii) for n not in S, a(n)=the smallest number different from a(1), ..., a(n-1) not breaking property (ii).

Table of values

List of values