A261382 - cp's OEIS frontend

A261382 Least positive integer k such that (k-1)^2+(kn)^2, k^2+(kn-1)^2, (k+1)^2+(kn)^2 and k^2+(kn+1)^2 are all prime.

n	a(n)
1	2
2	2510
3	15
4	30
5	5
6	510
7	730
8	440
9	195
10	6230
11	2040
12	2760
13	20
14	1010
15	12570
16	31340
17	1625
18	1650
19	725
20	2480
21	2160
22	520
23	1055
24	60
25	5
26	20
27	1260
28	25800
29	6185
30	6240
31	10
32	1180
33	12600
34	7500
35	5330
36	390
37	325
38	2880
39	11655
40	32670
41	5850
42	43110
43	3230
44	1470
45	7680
46	4950
47	255
48	202650
49	10530
50	450
51	2445
52	11670
53	8745
54	103350
55	80
56	6890
57	135
58	18930
59	80
60	245040

[2, 2510, 15, 30, 5, 510, 730, 440, 195, 6230, 2040, 2760, 20, 1010, 12570, 31340, 1625, 1650, 725, 2480, 2160, 520, 1055, 60, 5, 20, 1260, 25800, 6185, 6240, 10, 1180, 12600, 7500, 5330, 390, 325, 2880, 11655, 32670, 5850, 43110, 3230, 1470, 7680, 4950, 255, 202650, 10530, 450, 2445, 11670, 8745, 103350, 80, 6890, 135, 18930, 80, 245040]

cp's OEIS Frontend

A261382 Least positive integer k such that (k-1)^2+(kn)^2, k^2+(kn-1)^2, (k+1)^2+(kn)^2 and k^2+(kn+1)^2 are all prime.

Table of values

List of values

cp's OEIS Frontend

A261382 Least positive integer k such that (k-1)^2+(k*n)^2, k^2+(k*n-1)^2, (k+1)^2+(k*n)^2 and k^2+(k*n+1)^2 are all prime.

Table of values

List of values

A261382 Least positive integer k such that (k-1)^2+(kn)^2, k^2+(kn-1)^2, (k+1)^2+(kn)^2 and k^2+(kn+1)^2 are all prime.