A126938 - cp's OEIS frontend

A126938 a(1) = 3, a(n) = the smallest prime p > a(n-1) such that (a(n-1)+p)/2 is prime.

n	a(n)
1	3
2	7
3	19
4	43
5	79
6	127
7	151
8	163
9	199
10	223
11	331
12	367
13	379
14	439
15	487
16	607
17	619
18	643
19	739
20	883
21	991
22	1051
23	1087
24	1171
25	1231
26	1327
27	1471
28	1627
29	1699
30	1747
31	1759
32	1987
33	1999
34	2179
35	2383
36	2551
37	2683
38	2731
39	2767
40	3067
41	3259
42	3343
43	3571
44	3643
45	3739
46	3847
47	3907

[3, 7, 19, 43, 79, 127, 151, 163, 199, 223, 331, 367, 379, 439, 487, 607, 619, 643, 739, 883, 991, 1051, 1087, 1171, 1231, 1327, 1471, 1627, 1699, 1747, 1759, 1987, 1999, 2179, 2383, 2551, 2683, 2731, 2767, 3067, 3259, 3343, 3571, 3643, 3739, 3847, 3907]

cp's OEIS Frontend

A126938 a(1) = 3, a(n) = the smallest prime p > a(n-1) such that (a(n-1)+p)/2 is prime.

Table of values

List of values