A249797 - cp's OEIS frontend

A249797 a(1) = 2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a non-quadratic residue modulo a(k) for the next n indices k = n + 1, n + 2, ..., 2n.

n	a(n)
1	2
2	3
3	5
4	7
5	13
6	67
7	41
8	71
9	19
10	97
11	199
12	263
13	311
14	7121
15	3221
16	8581
17	373
18	977
19	331
20	1723
21	2161
22	27409
23	19079
24	42967
25	61441
26	206051
27	16649
28	212777
29	236527
30	572651
31	175897
32	258521
33	1010291
34	1369559
35	2530067

[2, 3, 5, 7, 13, 67, 41, 71, 19, 97, 199, 263, 311, 7121, 3221, 8581, 373, 977, 331, 1723, 2161, 27409, 19079, 42967, 61441, 206051, 16649, 212777, 236527, 572651, 175897, 258521, 1010291, 1369559, 2530067]

cp's OEIS Frontend

A249797 a(1) = 2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a non-quadratic residue modulo a(k) for the next n indices k = n + 1, n + 2, ..., 2n.

Table of values

List of values