A373805 - cp's OEIS frontend

A373805 If a(n-1) is not a prime, then a(n) = 2*a(n-1) + S; otherwise set S = -S and a(n) = prime(n) + S; start with a(1) = S = 1.

n	a(n)
1	1
2	3
3	4
4	7
5	12
6	25
7	51
8	103
9	22
10	43
11	32
12	65
13	131
14	42
15	83
16	54
17	109
18	60
19	119
20	237
21	473
22	945
23	1889
24	90
25	181
26	100
27	199
28	108
29	217
30	435
31	871
32	1743
33	3487
34	6975
35	13951
36	27903
37	55807
38	162
39	323
40	645
41	1289
42	182
43	365
44	731
45	1463
46	2927
47	210
48	419
49	228
50	457
51	232
52	463
53	242
54	485
55	971
56	262
57	523
58	272
59	545
60	1091

[1, 3, 4, 7, 12, 25, 51, 103, 22, 43, 32, 65, 131, 42, 83, 54, 109, 60, 119, 237, 473, 945, 1889, 90, 181, 100, 199, 108, 217, 435, 871, 1743, 3487, 6975, 13951, 27903, 55807, 162, 323, 645, 1289, 182, 365, 731, 1463, 2927, 210, 419, 228, 457, 232, 463, 242, 485, 971, 262, 523, 272, 545, 1091]

cp's OEIS Frontend

A373805 If a(n-1) is not a prime, then a(n) = 2*a(n-1) + S; otherwise set S = -S and a(n) = prime(n) + S; start with a(1) = S = 1.

Table of values

List of values