A125050 - cp's OEIS frontend

A125050 a(1) = 1. If a(n) is composite, a(n+1) = 2a(n)+1; otherwise, a(n+1) = 2a(n).

n	a(n)
1	1
2	2
3	4
4	9
5	19
6	38
7	77
8	155
9	311
10	622
11	1245
12	2491
13	4983
14	9967
15	19934
16	39869
17	79738
18	159477
19	318955
20	637911
21	1275823
22	2551646
23	5103293
24	10206587
25	20413175
26	40826351
27	81652702
28	163305405
29	326610811
30	653221623
31	1306443247
32	2612886495

[1, 2, 4, 9, 19, 38, 77, 155, 311, 622, 1245, 2491, 4983, 9967, 19934, 39869, 79738, 159477, 318955, 637911, 1275823, 2551646, 5103293, 10206587, 20413175, 40826351, 81652702, 163305405, 326610811, 653221623, 1306443247, 2612886495]

cp's OEIS Frontend

A125050 a(1) = 1. If a(n) is composite, a(n+1) = 2a(n)+1; otherwise, a(n+1) = 2a(n).

Table of values

List of values

cp's OEIS Frontend

A125050 a(1) = 1. If a(n) is composite, a(n+1) = 2*a(n)+1; otherwise, a(n+1) = 2*a(n).

Table of values

List of values

A125050 a(1) = 1. If a(n) is composite, a(n+1) = 2a(n)+1; otherwise, a(n+1) = 2a(n).