A217606 - cp's OEIS frontend

A217606 a(n) is the least unused prime greater than 3 such that (a(n) + a(n-1))/2 is prime, with a(0)=13.

n	a(n)
0	13
1	61
2	73
3	181
4	37
5	97
6	109
7	193
8	229
9	157
10	241
11	313
12	349
13	277
14	337
15	397
16	421
17	373
18	541
19	433
20	409
21	457
22	757
23	661
24	577
25	709
26	613
27	601
28	853
29	769
30	733
31	1021
32	997
33	877
34	829
35	673
36	1033
37	1009
38	1069
39	1117
40	1129
41	937
42	1201
43	1297
44	1549
45	1093
46	1153
47	1249
48	1213
49	1381

[13, 61, 73, 181, 37, 97, 109, 193, 229, 157, 241, 313, 349, 277, 337, 397, 421, 373, 541, 433, 409, 457, 757, 661, 577, 709, 613, 601, 853, 769, 733, 1021, 997, 877, 829, 673, 1033, 1009, 1069, 1117, 1129, 937, 1201, 1297, 1549, 1093, 1153, 1249, 1213, 1381]

cp's OEIS Frontend

A217606 a(n) is the least unused prime greater than 3 such that (a(n) + a(n-1))/2 is prime, with a(0)=13.

Table of values

List of values