A109306 - cp's OEIS frontend

A109306 Numbers k such that k^2 + (k-1)^2 and k^2 + (k+1)^2 are both primes.

n	a(n)
1	2
2	5
3	25
4	30
5	35
6	70
7	85
8	100
9	110
10	225
11	230
12	260
13	285
14	290
15	320
16	390
17	410
18	475
19	490
20	495
21	515
22	590
23	680
24	695
25	710
26	750
27	760
28	845
29	950
30	1080
31	1100
32	1135
33	1175
34	1190
35	1195
36	1270
37	1295
38	1305
39	1330
40	1365
41	1410
42	1475
43	1715
44	1750
45	1785
46	1845
47	1855
48	1925
49	2015
50	2060

[2, 5, 25, 30, 35, 70, 85, 100, 110, 225, 230, 260, 285, 290, 320, 390, 410, 475, 490, 495, 515, 590, 680, 695, 710, 750, 760, 845, 950, 1080, 1100, 1135, 1175, 1190, 1195, 1270, 1295, 1305, 1330, 1365, 1410, 1475, 1715, 1750, 1785, 1845, 1855, 1925, 2015, 2060]

cp's OEIS Frontend

A109306 Numbers k such that k^2 + (k-1)^2 and k^2 + (k+1)^2 are both primes.

Table of values

List of values