A305864 - cp's OEIS frontend

A305864 Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1 and k + 2.

n	a(n)
1	1
2	2
3	12
4	37
5	146
6	156
7	181
8	217
9	397
10	541
11	721
12	722
13	732
14	876
15	937
16	1082
17	1092
18	1117
19	1226
20	1236
21	1261
22	1442
23	1621
24	1657
25	1812
26	1981
27	2017
28	2197
29	2306
30	2316
31	2557
32	2676
33	2917
34	3061
35	3097
36	3252
37	3396
38	3457
39	3601
40	3612
41	3746
42	3781
43	3962
44	3997
45	4106
46	4177
47	4357
48	4501

[1, 2, 12, 37, 146, 156, 181, 217, 397, 541, 721, 722, 732, 876, 937, 1082, 1092, 1117, 1226, 1236, 1261, 1442, 1621, 1657, 1812, 1981, 2017, 2197, 2306, 2316, 2557, 2676, 2917, 3061, 3097, 3252, 3396, 3457, 3601, 3612, 3746, 3781, 3962, 3997, 4106, 4177, 4357, 4501]

cp's OEIS Frontend

A305864 Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1 and k + 2.

Table of values

List of values