A105120 - cp's OEIS frontend

A105120 a(1) = 2; k(1) = 0; for n > 1: k(n) = smallest number j >= k(n-1) such that 2a(n-1) + j is prime; a(n) = 2a(n-1) + k(n).

n	a(n)
1	2
2	5
3	11
4	23
5	47
6	97
7	197
8	397
9	797
10	1597
11	3203
12	6421
13	12889
14	25841
15	51749
16	103567
17	207227
18	414553
19	829211
20	1658533
21	3317177
22	6634469
23	13269059
24	26538257
25	53076679
26	106153547
27	212307299
28	424614829
29	849229907
30	1698460067
31	3396920419

[2, 5, 11, 23, 47, 97, 197, 397, 797, 1597, 3203, 6421, 12889, 25841, 51749, 103567, 207227, 414553, 829211, 1658533, 3317177, 6634469, 13269059, 26538257, 53076679, 106153547, 212307299, 424614829, 849229907, 1698460067, 3396920419]

cp's OEIS Frontend

A105120 a(1) = 2; k(1) = 0; for n > 1: k(n) = smallest number j >= k(n-1) such that 2a(n-1) + j is prime; a(n) = 2a(n-1) + k(n).

Table of values

List of values

cp's OEIS Frontend

A105120 a(1) = 2; k(1) = 0; for n > 1: k(n) = smallest number j >= k(n-1) such that 2*a(n-1) + j is prime; a(n) = 2*a(n-1) + k(n).

Table of values

List of values

A105120 a(1) = 2; k(1) = 0; for n > 1: k(n) = smallest number j >= k(n-1) such that 2a(n-1) + j is prime; a(n) = 2a(n-1) + k(n).