A249782 - cp's OEIS frontend

A249782 a(1)=2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a quadratic residue modulo a(k) for the next n indices k = n+1, n+2, ..., 2n.

n	a(n)
1	2
2	7
3	3
4	37
5	11
6	83
7	107
8	139
9	43
10	211
11	193
12	881
13	751
14	2777
15	2633
16	5981
17	6563
18	10531
19	3407
20	9871
21	12421
22	23873
23	6449
24	164789
25	3547
26	39877
27	248909
28	370081
29	528883
30	1144453
31	574813
32	1201153
33	1428929
34	2225053
35	1397719

[2, 7, 3, 37, 11, 83, 107, 139, 43, 211, 193, 881, 751, 2777, 2633, 5981, 6563, 10531, 3407, 9871, 12421, 23873, 6449, 164789, 3547, 39877, 248909, 370081, 528883, 1144453, 574813, 1201153, 1428929, 2225053, 1397719]

cp's OEIS Frontend

A249782 a(1)=2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a quadratic residue modulo a(k) for the next n indices k = n+1, n+2, ..., 2n.

Table of values

List of values